Islamic conquest of Persia
Encyclopedia
The Muslim conquest of Persia (Persian: حمله‌ی اعراب hamle-ye a'râb "the attack of the Arabs" or ظهور اسلام zohur-e eslâm "the dawn of Islam". The latter being officially preferred since the Iranian revolution) led to the end of the Sassanid Empire
Sassanid Empire
The Sassanid Empire , known to its inhabitants as Ērānshahr and Ērān in Middle Persian and resulting in the New Persian terms Iranshahr and Iran , was the last pre-Islamic Persian Empire, ruled by the Sasanian Dynasty from 224 to 651...

 in 644, the fall of Sassanid dynasty in 651 and the eventual decline of the Zoroastrian
Zoroastrianism
Zoroastrianism is a religion and philosophy based on the teachings of prophet Zoroaster and was formerly among the world's largest religions. It was probably founded some time before the 6th century BCE in Greater Iran.In Zoroastrianism, the Creator Ahura Mazda is all good, and no evil...

 religion in Persia. Arabs first entered Sassanid territory in 633, when general Khalid ibn Walid invaded what is now Iraq
Iraq
Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert....

. Following the transfer of Khalid to the Roman front in the Levant
Levant
The Levant or ) is the geographic region and culture zone of the "eastern Mediterranean littoral between Anatolia and Egypt" . The Levant includes most of modern Lebanon, Syria, Jordan, Israel, the Palestinian territories, and sometimes parts of Turkey and Iraq, and corresponds roughly to the...

, the Muslims eventually lost their holdings to Persian counterattacks. The second invasion began in 636 under Saad ibn Abi Waqqas, when a key victory at the Battle of Qadisiyyah led to the permanent end of Sassanid control west of Persia. The Zagros mountains
Zagros Mountains
The Zagros Mountains are the largest mountain range in Iran and Iraq. With a total length of 1,500 km , from northwestern Iran, and roughly correlating with Iran's western border, the Zagros range spans the whole length of the western and southwestern Iranian plateau and ends at the Strait of...

 then became a natural barrier and border between the Rashidun Caliphate
Rashidun Caliphate
The Rashidun Caliphate , comprising the first four caliphs in Islam's history, was founded after Muhammad's death in 632, Year 10 A.H.. At its height, the Caliphate extended from the Arabian Peninsula, to the Levant, Caucasus and North Africa in the west, to the Iranian highlands and Central Asia...

 and the Sassanid Empire. Owing to continuous raids by Persians into the area, Caliph Umar
Umar
`Umar ibn al-Khattāb c. 2 November , was a leading companion and adviser to the Islamic prophet Muhammad who later became the second Muslim Caliph after Muhammad's death....

 ordered a full invasion of the Sassanid Persian empire in 642, which was completed with the complete conquest of the Sassanids by mid 644. The quick conquest of Persia in a series of well coordinated multi-pronged attacks, directed by Caliph Umar from Medina
Medina
Medina , or ; also transliterated as Madinah, or madinat al-nabi "the city of the prophet") is a city in the Hejaz region of western Saudi Arabia, and serves as the capital of the Al Madinah Province. It is the second holiest city in Islam, and the burial place of the Islamic Prophet Muhammad, and...

 several thousand miles from the battlefields in Persia, became his greatest triumph, contributing to his reputation as a great military and political strategist.

Iranian historians have, for example, used exclusively Arab sources to illustrate that "contrary to the claims of some historians, Iranians, in fact, fought long and hard against the invading Arabs," thereby indicating Persian disdain for Arab culture and influence. This view furthermore holds that, once politically conquered, the Persians began to resist the Arabs culturally and maintained Persian, as opposed to Arab, culture. Regardless, Islam was adopted by many, either for political or socio cultural reasons, and became the dominant religion.

Historiography and recent scholarship

When Western academics first investigated the Muslim
Muslim
A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

 conquest of Persia, they only had to rely on the accounts of the Armenian Christian
Christian
A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

 bishop Sebeos
Sebeos
Sebeos was a 7th century Armenian bishop and historian who participated in the first Council of Dvin in 645.The history of Sebeos contains detailed descriptions from the period of Sassanid supremacy in Armenia up to the Islamic conquest in 661...

, and accounts in Arabic that were written some time after the events they describe. The most significant work was probably that of Arthur Christensen, and his L’Iran sous les Sassanides, published in Copenhagen
Copenhagen
Copenhagen is the capital and largest city of Denmark, with an urban population of 1,199,224 and a metropolitan population of 1,930,260 . With the completion of the transnational Øresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Øresund Region...

 and Paris
Paris
Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...

 in 1944.

However recent scholarship, both Iranian and Western, has begun to question the traditional narrative. Parvaneh Pourshariati, in his Decline and Fall of the Sasanian Empire: The Sasanian-Parthian Confederacy and the Arab Conquest of Iran, published in 2008, provides both a detailed overview of the problematic nature of trying to establish exactly what happened, and a great deal of original research that questions fundamental facts of the traditional narrative, including the timeline and specific dates.

Pourshariati's central thesis is that contrary to what was commonly assumed, the Sassanian Empire was highly decentralized, and was in fact a "confederation" with the Parthians, who themselves retained a high level of independence. Despite their recent victories over the Byzantines, and the threat of the Byzantines being forced to become a client-state of the Sassanians, the Parthians unexpectedly withdrew with from confederation, and the Sassanians were thus ill-prepared and ill-equipped to mount an effective and cohesive defense against the Muslim
Muslim
A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

 invaders. Moreover, the powerful northern and eastern Parthian families, the kust-i khwarasan and kust-i adurbadagan, withdrew to their respective strongholds and made peace with the Arabs, refusing to fight alongside the Sassians.

Another important them of Pourshariati's study is a reevaluation of the traditional timeline. Pourshariati argues that the Arab conquest of Mesopotamia "took place, not, as has been conventionally believed, in the years 632–634, after the accession of the last Sasanian king Yazdgird III (632–651) to power, but in the period from 628 to 632."

An important consequence in this change in timeline, means that the Arab
Arab
Arab people, also known as Arabs , are a panethnicity primarily living in the Arab world, which is located in Western Asia and North Africa. They are identified as such on one or more of genealogical, linguistic, or cultural grounds, with tribal affiliations, and intra-tribal relationships playing...

 aggression took place precisely when the Sassanians and Parthians were engaged in internecine warfare over who was to succeed the Sassanian throne.

Sassanid Empire Before the Conquest

Since the 1st century BC, the border between the Roman
Roman Empire
The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 (later Byzantine
Byzantine Empire
The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

) and Parthian
Parthian Empire
The Parthian Empire , also known as the Arsacid Empire , was a major Iranian political and cultural power in ancient Persia...

 (later Sassanid
Sassanid Empire
The Sassanid Empire , known to its inhabitants as Ērānshahr and Ērān in Middle Persian and resulting in the New Persian terms Iranshahr and Iran , was the last pre-Islamic Persian Empire, ruled by the Sasanian Dynasty from 224 to 651...

) empires had been the Euphrates
Euphrates
The Euphrates is the longest and one of the most historically important rivers of Western Asia. Together with the Tigris, it is one of the two defining rivers of Mesopotamia...

 river. The border was constantly contested. Most battles, and thus most fortifications, were concentrated in the hilly regions of the north, as the vast Arabian or Syrian Desert
Syrian Desert
The Syrian Desert , also known as the Syro-Arabian desert is a combination of steppe and true desert that is located in the northern Arabian Peninsula covering 200,000 square miles . also the desert is very rocky and flat...

 (Roman Arabia) separated the rival empires in the south. The only dangers expected from the south were occasional raids by nomadic Arab
Arab
Arab people, also known as Arabs , are a panethnicity primarily living in the Arab world, which is located in Western Asia and North Africa. They are identified as such on one or more of genealogical, linguistic, or cultural grounds, with tribal affiliations, and intra-tribal relationships playing...

 tribesmen. Both empires therefore allied themselves with small, semi-independent Arab principalities, which served as buffer states and protected Byzantium and Persia from Bedouin
Bedouin
The Bedouin are a part of a predominantly desert-dwelling Arab ethnic group traditionally divided into tribes or clans, known in Arabic as ..-Etymology:...

 attacks. The Byzantine clients were the Ghassanids; the Persian clients were the Lakhmids. The Ghassanids and Lakhmids feuded constantly—which kept them occupied, but that did not greatly affect the Byzantines or the Persians. In the 6th and 7th centuries, various factors destroyed the balance of power that had held for so many centuries.

Revolt of the Arab Client States (602)

The Byzantine clients, the Arab Ghassanids
Ghassanids
The Ghassanids were a group of South Arabian Christian tribes that emigrated in the early 3rd century from Yemen to Syria, Jordan, Lebanon and the Holy Land....

, converted to the Monophysite form of Christianity
Christianity
Christianity is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings...

, which was regarded as heretical
Heresy
Heresy is a controversial or novel change to a system of beliefs, especially a religion, that conflicts with established dogma. It is distinct from apostasy, which is the formal denunciation of one's religion, principles or cause, and blasphemy, which is irreverence toward religion...

 by the established Byzantine Orthodox Church. The Byzantines attempted to suppress the heresy, alienating the Ghassanids and sparking rebellions on their desert frontiers. The Lakhmids
Lakhmids
The Lakhmids , Banu Lakhm , Muntherids , were a group of Arab Christians who lived in Southern Iraq, and made al-Hirah their capital in 266. Poets described it as a Paradise on earth, an Arab Poet described the city's pleasant climate and beauty "One day in al-Hirah is better than a year of...

 also revolted against the Persian king Khusrau II. Nu'man III (son of Al-Monder IV), the first Christian Lakhmid king, was deposed and killed by Khusrau II in 602, because of his attempt to throw off the Persian tutelage. After Khusrau's assassination, the Persian Empire fractured and the Lakhmids
Lakhmids
The Lakhmids , Banu Lakhm , Muntherids , were a group of Arab Christians who lived in Southern Iraq, and made al-Hirah their capital in 266. Poets described it as a Paradise on earth, an Arab Poet described the city's pleasant climate and beauty "One day in al-Hirah is better than a year of...

 were effectively semi-independent. It is now widely believed that the annexation of the Lakhmid kingdom was one of the main factors behind the Fall of Sassanid dynasty, to the Muslim Arabs and the Islamic conquest of Persia, as the Lakhmids agreed to act as spies for the Muslims after being defeated in the Battle of Hira
Battle of Hira
Al-Hirah city, widely known for its size and wealth, was a Sassanian dukedom as it was the capital of the Persian province of Iraq. Many of its Lakhmid Christian Arab inhabitants patrolled the desert on behalf of the Sassanians...

 by Khalid ibn al-Walid
Khalid ibn al-Walid
Khālid ibn al-Walīd also known as Sayf Allāh al-Maslūl , was a companion of the Islamic prophet Muhammad. He is noted for his military tactics and prowess, commanding the forces of Medina and those of his immediate successors of the Rashidun Caliphate; Abu Bakr and Umar...

.

Byzantine–Sassanid War (612–629)

The Persian ruler Khosrau II (Parviz)
Khosrau II
250px|thumb|Khosrau II 250px|thumb|Khosrau II 250px|thumb|Khosrau II (Khosrow II, Chosroes II, or Xosrov II in classical sources, sometimes called Parvez, "the Ever Victorious" – (in Persian: خسرو پرویز), was the twenty-second Sassanid King of Persia, reigning from 590 to 628...

 defeated a dangerous rebellion within his own empire, the Bahram Chobin
Bahram Chobin
General Bahrām Chobin was a famous Eran spahbod during the late 6th century in Persia, usurping the Sassanid throne for a year as Bahram VI .- Life :...

's rebellion. He afterward turned his energies towards his traditional Byzantine enemies, leading to the Byzantine-Sassanid War of 602–628
Byzantine-Sassanid War of 602–628
The Byzantine–Sassanid War of 602–628 was the final and most devastating of the series of wars fought between the Roman Empire and the Sassanid Empire. The previous war had ended in 591 after Emperor Maurice had helped the Sassanian king Khosrau II regain his throne. In 602, Maurice was murdered...

. For a few years, he succeeded gloriously. From 612 to 622, he extended the Persian borders almost to the same extent that they were under the Achaemenid dynasty (550–330 BC), capturing Western states as far as Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

, the Holy Land
Holy Land
The Holy Land is a term which in Judaism refers to the Kingdom of Israel as defined in the Tanakh. For Jews, the Land's identifiction of being Holy is defined in Judaism by its differentiation from other lands by virtue of the practice of Judaism often possible only in the Land of Israel...

, and more.

The Byzantines regrouped and pushed back in 622 under Heraclius
Heraclius
Heraclius was Byzantine Emperor from 610 to 641.He was responsible for introducing Greek as the empire's official language. His rise to power began in 608, when he and his father, Heraclius the Elder, the exarch of Africa, successfully led a revolt against the unpopular usurper Phocas.Heraclius'...

. Khosrau was defeated at the Battle of Nineveh
Battle of Nineveh (627)
The Battle of Nineveh was the climactic battle of the Byzantine-Sassanid War of 602–628. The Byzantine victory broke the power of the Sassanid dynasty and for a period of time restored the empire to its ancient boundaries in the Middle East...

 in 627, and the Byzantines recaptured all of Syria
Syria
Syria , officially the Syrian Arab Republic , is a country in Western Asia, bordering Lebanon and the Mediterranean Sea to the West, Turkey to the north, Iraq to the east, Jordan to the south, and Israel to the southwest....

 and penetrated far into the Persian provinces of Mesopotamia
Mesopotamia
Mesopotamia is a toponym for the area of the Tigris–Euphrates river system, largely corresponding to modern-day Iraq, northeastern Syria, southeastern Turkey and southwestern Iran.Widely considered to be the cradle of civilization, Bronze Age Mesopotamia included Sumer and the...

. In 629, Khosrau's general Shahrbaraz
Shahrbaraz
Shahrbaraz or Shahrwaraz was a general, with the rank of Eran Spahbod under Khosrau II . His name was Farrokhan, and Shahrbaraz was his title...

 agreed to peace, and the border between the two empires was once again the same as it was in 602.

Assassination of Khosrau II

Khosrau II was assassinated in 628 and as a result, there were numerous claimants to the throne; from 628 to 632 there were ten kings and queens of Persia. The last, Yazdegerd III, was a grandson of Khosrau II and was said to be a mere child. However, no date of birth is known.

During Muhammad's life

After the Treaty of Hudaybiyyah
Treaty of Hudaybiyyah
The Treaty of Hudaybiyyah is the treaty that took place between the state of Medina and the Quraishi tribe of Mecca in March 628CE .-Background:...

 in 628, Islamic tradition holds that Muhammad
Muhammad
Muhammad |ligature]] at U+FDF4 ;Arabic pronunciation varies regionally; the first vowel ranges from ~~; the second and the last vowel: ~~~. There are dialects which have no stress. In Egypt, it is pronounced not in religious contexts...

 sent many letters to the princes, kings, and chiefs of the various tribes and kingdoms of the time, inviting them to convert to Islam. These letters were carried by ambassadors to Persia, Byzantium
Byzantium
Byzantium was an ancient Greek city, founded by Greek colonists from Megara in 667 BC and named after their king Byzas . The name Byzantium is a Latinization of the original name Byzantion...

, Ethiopia
Ethiopia
Ethiopia , officially known as the Federal Democratic Republic of Ethiopia, is a country located in the Horn of Africa. It is the second-most populous nation in Africa, with over 82 million inhabitants, and the tenth-largest by area, occupying 1,100,000 km2...

, Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

, Yemen
Yemen
The Republic of Yemen , commonly known as Yemen , is a country located in the Middle East, occupying the southwestern to southern end of the Arabian Peninsula. It is bordered by Saudi Arabia to the north, the Red Sea to the west, and Oman to the east....

, and Hira
Hira (disambiguation)
Hira may mean:*Hira, a cave where Prophet Muhammad received his first revelations from Allah*Al-Hirah, an ancient Arab city in Iraq*Hira , an old Jewish ghetto in Tunis, see History of the Jews in Tunisia*Hira Mountains, Japan...

 (Iraq) on the same day. This assertion has been cast into scrutiny by some modern historians of Islam—notably Grimme and Caetani. Particularly in dispute is the assertion that Khosrau II received a letter from Muhammad, as the Sassanid court ceremony was notoriously intricate, and it is unlikely that a letter from what at the time was a minor regional power would have reached the hands of the Shahanshah.

With regards to Persia, Muslim histories further recount that at the beginning of the seventh year of migration, Muhammad appointed one of his officers, Abdullah Huzafah Sahmi Qarashi, to carry his letter to Khosrau II
Khosrau II
250px|thumb|Khosrau II 250px|thumb|Khosrau II 250px|thumb|Khosrau II (Khosrow II, Chosroes II, or Xosrov II in classical sources, sometimes called Parvez, "the Ever Victorious" – (in Persian: خسرو پرویز), was the twenty-second Sassanid King of Persia, reigning from 590 to 628...

 inviting him to Islam:

"In the name of Allah, the Beneficent, the Merciful.

From Muhammad, the Messenger of Allah, to the great Kisra of Iran. Peace be upon him, who seeks truth and expresses belief in Allah and in His Prophet and testifies that there is no god but Allah and that He has no partner, and who believes that Muhammad is His servant and Prophet. Under the Command of Allah, I invite you to Him. He has sent me for the guidance of all people so that I may warn them all of His wrath and may present the unbelievers with an ultimatum. Embrace Islam so that you may remain safe. And if you refuse to accept Islam, you will be responsible for the sins of the Magi."


There are differing accounts of the reaction of Khosrau II
Khosrau II
250px|thumb|Khosrau II 250px|thumb|Khosrau II 250px|thumb|Khosrau II (Khosrow II, Chosroes II, or Xosrov II in classical sources, sometimes called Parvez, "the Ever Victorious" – (in Persian: خسرو پرویز), was the twenty-second Sassanid King of Persia, reigning from 590 to 628...

. Nearly all assert that he destroyed the letter in anger; the variations concentrate on the extent and detail of his response.

Rise of the Caliphate

Muhammad died in June 632, and Abu Bakr
Abu Bakr
Abu Bakr was a senior companion and the father-in-law of the Islamic prophet Muhammad. He ruled over the Rashidun Caliphate from 632-634 CE when he became the first Muslim Caliph following Muhammad's death...

 was appointed Caliph
Caliph
The Caliph is the head of state in a Caliphate, and the title for the ruler of the Islamic Ummah, an Islamic community ruled by the Shari'ah. It is a transcribed version of the Arabic word   which means "successor" or "representative"...

 and political successor at Medina
Medina
Medina , or ; also transliterated as Madinah, or madinat al-nabi "the city of the prophet") is a city in the Hejaz region of western Saudi Arabia, and serves as the capital of the Al Madinah Province. It is the second holiest city in Islam, and the burial place of the Islamic Prophet Muhammad, and...

. Soon after Abu Bakr
Abu Bakr
Abu Bakr was a senior companion and the father-in-law of the Islamic prophet Muhammad. He ruled over the Rashidun Caliphate from 632-634 CE when he became the first Muslim Caliph following Muhammad's death...

's succession, several Arab tribes revolted, in the Ridda Wars
Ridda wars
The Ridda wars , also known as the Wars of Apostasy, were a series of military campaigns against the rebellion of several Arabian tribes launched by the Caliph Abu Bakr during 632 and 633 AD, after prophet Muhammad died....

 (Arabic
Arabic language
Arabic is a name applied to the descendants of the Classical Arabic language of the 6th century AD, used most prominently in the Quran, the Islamic Holy Book...

 for the Wars of Apostasy). The Ridda Wars preoccupied the Caliphate
Caliphate
The term caliphate, "dominion of a caliph " , refers to the first system of government established in Islam and represented the political unity of the Muslim Ummah...

 until March 633, and ended with the entirety of the Arab Peninsula under the authority of the Caliph at Medina.

Whether Abu Bakr intended a full-out imperial conquest or not is hard to say; he did, however, set in motion a historical trajectory that in just a few short decades would lead to one of the largest empires in history, beginning with a confrontation with the Sassanid Empire under the general Khalid ibn al-Walid
Khalid ibn al-Walid
Khālid ibn al-Walīd also known as Sayf Allāh al-Maslūl , was a companion of the Islamic prophet Muhammad. He is noted for his military tactics and prowess, commanding the forces of Medina and those of his immediate successors of the Rashidun Caliphate; Abu Bakr and Umar...

.

First conquest of Mesopotamia (633)

After the Ridda Wars
Ridda wars
The Ridda wars , also known as the Wars of Apostasy, were a series of military campaigns against the rebellion of several Arabian tribes launched by the Caliph Abu Bakr during 632 and 633 AD, after prophet Muhammad died....

, a tribal chief of north eastern Arabia, Muthana ibn Harith, raided the Persian towns in Mesopotamia
Mesopotamia
Mesopotamia is a toponym for the area of the Tigris–Euphrates river system, largely corresponding to modern-day Iraq, northeastern Syria, southeastern Turkey and southwestern Iran.Widely considered to be the cradle of civilization, Bronze Age Mesopotamia included Sumer and the...

 (what is now Iraq
Iraq
Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert....

). With the success of the raids, a considerable amount of booty was collected. Muthana ibn Harith went to Medina to inform Caliph Abu Bakr about his success and was appointed commander of his people, after which he began to raid deeper into Mesopotamia. Using the mobility of his light cavalry
Light cavalry
Light cavalry refers to lightly armed and lightly armored troops mounted on horses, as opposed to heavy cavalry, where the riders are heavily armored...

 he could easily raid any town near the desert
Desert
A desert is a landscape or region that receives an extremely low amount of precipitation, less than enough to support growth of most plants. Most deserts have an average annual precipitation of less than...

 and disappear again into the desert, into which the Sassanid army
Sassanid army
The birth of the Sassanid army dates back to the rise of Ardashir I , the founder of the Sassanid dynasty, to the throne. Ardashir aimed at the revival of the Persian Empire, and to further this aim, he reformed the military by forming a standing army which was under his personal command and whose...

 was unable to chase them. Misnah’s acts made Abu Bakr think about the expansion of the Rashidun Empire
Rashidun Empire
The Rashidun Caliphate , comprising the first four caliphs in Islam's history, was founded after Muhammad's death in 632, Year 10 A.H.. At its height, the Caliphate extended from the Arabian Peninsula, to the Levant, Caucasus and North Africa in the west, to the Iranian highlands and Central Asia...

.

To be certain of victory, Abu Bakr made two decisions concerning the attack on Persia: first, the invading army would consist entirely of volunteers; and second, to put in command of the army his best general: Khalid ibn al-Walid. After defeating the self-proclaimed prophet Musaylimah
Musaylimah
Musaylimah or Maslamah bin Ḥabīb was one of a series of men who claimed to be a prophet around the same time as Muhammad. He is viewed as a false prophet by traditional accounts, and frequently referred to by the epithet "the Liar" .-Biography:...

 in the Battle of Yamama
Battle of Yamama
The Battle of Yamama was fought in December AD 632 as part as the Ridda or apostate wars on the plain of Aqraba in the region of Yamama between the forces of Muslim Caliph Abu Bakr and Musaylimah, an apostate.-Background:...

, Khalid was still at Al-Yamama
Al-Yamama
Al-Yamamah is an ancient district lying to the east of the plateau of Najd in modern-day Saudi Arabia, or sometimes more specifically, the now-extinct ancient village of Jaww Al-Yamamah, near Al-Kharj, after which the rest of the region was named...

 when Abu Bakr sent him orders to invade the Sassanid Empire. Making Al-Hirah
Al-Hirah
Al Hīra was an ancient city located south of al-Kufah in south-central Iraq.- Middle Ages:Al Hīra was a significant city in pre-Islamic Arab history. Originally a military encampment, in the 5th and 6th centuries CE it became the capital of the Lakhmids.The Arabs were migrating into the Near East...

 the objective of Khalid, Abu Bakr sent reinforcements and ordered the tribal chiefs of north eastern Arabia, Misnah ibn Haris, Mazhur bin Adi, Harmala and Sulma to operate under the command of Khalid along with their men. Around the third week of March 633 (first week of Muharram
Muharram
Muharram is the first month of the Islamic calendar. It is one of the four sacred months of the year in which fighting is prohibited...

 12th Hijrah) Khalid set out from Al-Yamama with an army of 10,000. The tribal chiefs, with 2,000 warriors each, joined Khalid; so Khalid entered the Persian Empire with 18,000 troops.

After entering Mesopotamia with his army of 18,000, Khalid won decisive victories in four consecutive battles: the Battle of Chains
Battle of Chains
The Battle of Sallasil or the Battle of Chains was the first battle fought between the Rashidun Caliphate and the Sassanid Persian Empire. The battle was fought soon after the Ridda Wars were over and Arabia was united under the authority of Caliph Abu Bakr...

, fought in April 633; the Battle of River
Battle of River
According to Arab and Muslim sources, the Battle of River took place in Mesopotamia between the forces of the Rashidun Caliphate and the Persian Empire. Muslims, under Khalid ibn al-Walid's command, defeated the numerically superior Persian army....

, fought in the 3rd week of April 633 A.D; the Battle of Walaja
Battle of Walaja
The Battle of Walaja was a battle fought in Mesopotamia in May 633 between the Rashidun Caliphate army under Khalid ibn al-Walid and al muthanna ibn haarithah against the Persian Empire and its Arab allies...

, fought in May 633 (where he successfully used a double envelopment
Pincer movement
The pincer movement or double envelopment is a military maneuver. The flanks of the opponent are attacked simultaneously in a pinching motion after the opponent has advanced towards the center of an army which is responding by moving its outside forces to the enemy's flanks, in order to surround it...

 manoeuvre), and the Battle of Ullais
Battle of Ullais
The Battle of Ullais was fought between the forces of the Rashidun Caliphate and the Sassanid Persian Empire in the middle of May 633 A.D in Iraq, and is sometimes referred to as the Battle of Blood River since, as a result of the battle, there were enormous amounts of Sassanian and Arab Christian...

, fought in the mid of May, 633 A.D. The Persian court, already disturbed by internal problems, was thrown into chaos. In the last week of May 633, the important city of Hira
Hira
Hira or the Cave of Hira is a cave about from Mecca, on the mountain named Jabal Al-Nūr in the Hejaz region of present day Saudi Arabia...

 fell to the Muslims after their victory in the Siege of Hira
Battle of Hira
Al-Hirah city, widely known for its size and wealth, was a Sassanian dukedom as it was the capital of the Persian province of Iraq. Many of its Lakhmid Christian Arab inhabitants patrolled the desert on behalf of the Sassanians...

. After resting his armies, in June 633 Khalid laid siege to the city of Al Anbar, which resisted and eventually surrendered after a siege of a few weeks in July 633 after the Siege of Al-Anbar
Battle of Al-Anbar
the Muslim Arab army was under the command of Khalid ibn al-Walid and the battle took place at Anbar which is located approximately 80 miles from the ancient city of Babylon. Khalid besieged the Sassanian Persians in the city fortress, which had strong walls. Scores of Muslim archers were used in...

. Khalid then moved towards the south, and conquered the city of Ein ul Tamr after the Battle of Ein ut Tamr
Battle of ein-ul-tamr
When the Muslim army conquered the town of Ayn al-Tamr they found a number of Arab Christian priests in a monastery. One of them was called Nusair another called Serine. They both embraced Islam. Nusair is the father of Mosa Ben Nusair, the supreme commander of the forces which later conquered...

 in the last week of July, 633. At this point, most of what is now Iraq was under Islamic control.

Khalid got a call of help from northern Arabia at Daumat-ul-Jandal, where another Muslim Arab general, Ayaz bin Ghanam, was trapped among the rebel tribes. Khalid went to Daumat-ul-jandal and defeated the rebels in the Battle of Daumat-ul-jandal
Battle of Daumat-ul-jandal
The Battle of Daumat-ul-jandal took place between Muslims and Rebel Arab tribes in August 633 AD. This was a part of the Riddah wars. Daumat ul jandal was given to Ayadh bin Ghanam to crush the rebels, but he failed in doing so, and send for help to Khalid ibn Walid who was in Iraq in those...

 in the last week of August, 633. Returning from Arabia, he got news of the assembling of a large Persian army. He decided to defeat them all separately to avoid the risk of being defeated by a large unified Persian army. Four divisions of Persian and Christian
Christian
A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

 Arab auxiliaries were present at Hanafiz, Zumiel, Sanni and Muzieh. Khalid devised a brilliant plan to destroy the Persian forces. He divided his army in three units, and attacked the Persian forces in well coordinated attacks from three different sides at night, starting from the Battle of Muzieh, then the Battle of Sanni, and finally the Battle of Zumail
Battle of Zumail
The battle of Zumail was fought in 633 CE in what is now Iraq. It was a major Muslim victory in their conquest of that area. Under cover of night the Muslims attacked the Christian-Arab forces from three different sides...

 during November 633. These devastating defeats ended Persian control over Mesopotamia, and left the Persian capital Ctesiphon
Ctesiphon
Ctesiphon, the imperial capital of the Parthian Arsacids and of the Persian Sassanids, was one of the great cities of ancient Mesopotamia.The ruins of the city are located on the east bank of the Tigris, across the river from the Hellenistic city of Seleucia...

 unguarded and vulnerable to Muslim attack. Before attacking the Persian capital, Khalid decided to eliminate all Persian forces in the south and west. He accordingly marched against the border city of Firaz, where he defeated the combined forces of the Sassanid Persians
Sassanid army
The birth of the Sassanid army dates back to the rise of Ardashir I , the founder of the Sassanid dynasty, to the throne. Ardashir aimed at the revival of the Persian Empire, and to further this aim, he reformed the military by forming a standing army which was under his personal command and whose...

, the Byzantine
Byzantine army
The Byzantine army was the primary military body of the Byzantine armed forces, serving alongside the Byzantine navy. A direct descendant of the Roman army, the Byzantine army maintained a similar level of discipline, strategic prowess and organization...

 Romans
Roman army
The Roman army is the generic term for the terrestrial armed forces deployed by the kingdom of Rome , the Roman Republic , the Roman Empire and its successor, the Byzantine empire...

 and Christian Arabs in the Battle of Firaz
Battle of Firaz
The Battle of Firaz was the last battle of the Muslim Arab commander Khalid ibn al-Walid in Mesopotamia against the combined forces of the Byzantine Roman Empire, Sassanid Persian Empire, and Christian Arabs...

 in December 633. This was the last battle in his conquest of Mesopotamia. While Khalid was on his way to attack Qadissiyah (a key fort in the way to the Persian capital Ctesiphon), he received a letter from Caliph Abu Bakr and was sent to the Roman front in Syria to assume the command of the Muslim armies to conquer Roman Syria.

Second invasion of Mesopotamia (636)

According to the will of Abu Bakr, Umar was to continue the conquest of Syria and Mesopotamia. On the northeastern borders of the Empire, in Mesopotamia, the situation was deteriorating day by day. During Abu Bakr
Abu Bakr
Abu Bakr was a senior companion and the father-in-law of the Islamic prophet Muhammad. He ruled over the Rashidun Caliphate from 632-634 CE when he became the first Muslim Caliph following Muhammad's death...

’s era, Khalid ibn al-Walid
Khalid ibn al-Walid
Khālid ibn al-Walīd also known as Sayf Allāh al-Maslūl , was a companion of the Islamic prophet Muhammad. He is noted for his military tactics and prowess, commanding the forces of Medina and those of his immediate successors of the Rashidun Caliphate; Abu Bakr and Umar...

 had been sent to the Syrian front to command the Islamic armies there. As soon as Khalid had left Mesopotamia with half his army of 9000 soldiers, the Persians decided to take back their lost territory. The Muslim army was forced to leave the conquered areas and concentrate on the border areas. Umar immediately sent reinforcements to aid Misna ibn Haris in Mesopotamia under the command of Abu Ubaid al Saqafi. The Persian forces defeated Abu Ubaid in the Battle of Bridge. However, later Persian forces were defeated by Misnah bin harisah in the Battle of Baiyoub. In 635 Yazdgerd III
Yazdgerd III
Yazdegerd III or Yazdgerd III was the twenty-ninth and last king of the Sassanid dynasty of Iran and a grandson of Khosrau II . His father was Shahryar, whose mother was Miriam, the daughter of the Byzantine Emperor Maurice...

 sought alliance with Emperor Heraclius
Heraclius
Heraclius was Byzantine Emperor from 610 to 641.He was responsible for introducing Greek as the empire's official language. His rise to power began in 608, when he and his father, Heraclius the Elder, the exarch of Africa, successfully led a revolt against the unpopular usurper Phocas.Heraclius'...

 of the Eastern Roman Empire. Heraclius married his daughter (according to traditions, his grand daughter) to Yazdegerd III, an old Roman tradition to show alliance. While Heraclius prepared for a major offense in the Levant, Yazdegerd, meanwhile, ordered the concentration of massive armies to pull back the Muslims from Mesopotamia for good. The goal was well coordinated attacks by both emperors, Heraclius in the Levant and Yazdegerd in Mesopotamia, to annihilate the power of their common enemy Caliph Umar.

Battle of Qadisiyyah

Umar ordered his army to retreat to the bordering areas of Mesopotamia near the Arabian desert and began raising armies for another campaign into Mesopotamia. The Arab armies were concentrated near Madinah, and owing to the critical situation Umar wished to command the army in person. This idea was opposed by the members of Majlis al Shura
Majlis al Shura
Majlis al Shura is a transliteration of the Arabicمجلس الشورىwhich means approximately "consultative council", although it has been co-opted as a term for Parliament or Advisory Council. Its pronunciation is approximately "majlis ash-shura"....

 at Madinah, who claimed that the two-front war required Umar's presence in Madinah. Umar appointed Saad ibn Abi Waqqas as commander for the campaign in Mesopotamia. Saad left Medina with his army in May 636 and arrived at Qadisiyyah
Al-Qadisiyyah (historical city)
Al-Qādisiyyah, a historical city in southern Mesopotamia, southwest of al-Hillah and al-Kūfah in Iraq, is most famous as the site of the Battle of al-Qādisiyyah in circa 636, which saw a force of Arab-Muslim invaders defeat a larger army sent by the Sāsānian Empire.-Commercial importance:Prior to...

 in June.

While Heraclius launched his offensive in May 636, Yazdegerd was unable to muster his armies in time to provide the Byzantines with Persian support. Umar, allegedly aware of this alliance, capitalized on this failure: not wanting to risk a battle with two great powers simultaneously, he quickly moved to reinforce the Muslim army at Yarmouk
Yarmouk
* Yarmouk River* Battle of Yarmouk* Yarmouk University in Jordan* Yarmouk , an upscale neighborhood in Iraq* Al-Yarmouk Hospital * Yarmouk , an unofficial Palestinian refugee camp in Syria...

 to engage and defeat the Byzantines. Meanwhile, Umar ordered Saad to enter into peace negotiations with Yazdegerd III and invite him to Islam
Islam
Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

 to prevent Persian forces from taking the field. Heraclius instructed his general Vahan
Vahan
Vahan or Vahana is a Sanskrit word meaning 'vehicle.' More specifically it means 'a vehicle of consciousness'.'Vahan' may also refer to:* Vahan, Armenia - a town* VAHAN - an Armenian manufactured assault rifle...

 not to engage in battle with the Muslims before receiving explicit orders; however, fearing more Arab reinforcements, Vahan attacked the Muslim army in the Battle of Yarmouk
Battle of Yarmouk
The Battle of Yarmouk was a major battle between the Muslim Arab forces of the Rashidun Caliphate and the armies of the East Roman-Byzantine Empire. The battle consisted of a series of engagements that lasted for six days in August 636, near the Yarmouk River, along what is today the border...

 in August 636. Heraclius's Imperial army was routed.

With the Byzantine threat ended, Umar instructed Saad to end negotiations and engage the Persian armies. The Sassanid Empire was still a formidable power with vast manpower reserves, and the Arabs soon found themselves confronting a huge Persian army with troops drawn from every corner of the empire and commanded by its foremost generals. Among the troops were fearsome war elephants that the Persian commander brought with him for the sole purpose of vanquishing the Muslims. Within three months, Saad defeated the Persian army in the Battle of al-Qādisiyyah
Battle of al-Qadisiyyah
The Battle of al-Qādisiyyah was fought in 636; it was the decisive engagement between the Arab muslim army and the Sassanid Persian army during the first period of Muslim expansion. It resulted in the Islamic conquest of Persia, and was key to the conquest of Iraq...

, effectively ending Sassanid rule west of Persia proper. This victory is largely regarded as a decisive turning point in Islam's growth: with the bulk of Persian forces defeated, Saad later conquered Babylon
Babylon
Babylon was an Akkadian city-state of ancient Mesopotamia, the remains of which are found in present-day Al Hillah, Babil Province, Iraq, about 85 kilometers south of Baghdad...

, Koosie, Bahrahsher and Madein. Ctesiphon, the Imperial capital of the Sassanid Empire, fell in March 637 after a siege of three months.
Iran
Iran
Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

ian historian Kaveh Farrokh, in his book Shadows in the Desert: Ancient Persia at War, describes the event of fall of Ctesiphon as:

Conquest of Mesopotamia (636–638)

After the conquest of Ctesiphon
Ctesiphon
Ctesiphon, the imperial capital of the Parthian Arsacids and of the Persian Sassanids, was one of the great cities of ancient Mesopotamia.The ruins of the city are located on the east bank of the Tigris, across the river from the Hellenistic city of Seleucia...

, several detachments were immediately sent west to capture Qarqeesia and Heet
Heet
Heet or HEET may refer to*HEET, High Entrance/Exit Turnstile*Iso-HEET, a brand of isopropanol antifreeze produced by Gold Eagle*Hīt, a city in Iraq...

 the forts at the border of the Byzantine Empire. Several fortified Persian armies were still active north-east of Ctesiphon at Jalula and north of the Tigris
Tigris
The Tigris River is the eastern member of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of southeastern Turkey through Iraq.-Geography:...

 at Tikrit
Tikrit
Tikrit is a town in Iraq, located 140 km northwest of Baghdad on the Tigris river . The town, with an estimated population in 2002 of about 260,000 is the administrative center of the Salah ad Din Governorate.-Ancient times:...

 and Mosul
Mosul
Mosul , is a city in northern Iraq and the capital of the Ninawa Governorate, some northwest of Baghdad. The original city stands on the west bank of the Tigris River, opposite the ancient Assyrian city of Nineveh on the east bank, but the metropolitan area has now grown to encompass substantial...

.

After withdrawal from Ctesiphon, the Persian armies gathered at Jalaula north-east of Ctesiphon. Jalaula was a place of strategic importance because from here routes led to Mesopotamia, Khurasan and Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

. The Persian forces at Jalula were commanded by General Mihran. His deputy was General Khurrazad, a brother of General Rustam, who had commanded the Persian forces at the Battle of al-Qadisiyyah
Battle of al-Qadisiyyah
The Battle of al-Qādisiyyah was fought in 636; it was the decisive engagement between the Arab muslim army and the Sassanid Persian army during the first period of Muslim expansion. It resulted in the Islamic conquest of Persia, and was key to the conquest of Iraq...

. As instructed by the Caliph Umar, Saad reported everything to Umar. The Caliph decided to deal with Jalula first. His plan was first to clear the way to the north before taking any decisive action against Tikrit and Mosul. Umar appointed Hashim ibn Uthba to the expedition of Jalula and Abdullah ibn Mutaam to conquer Tikrit
Tikrit
Tikrit is a town in Iraq, located 140 km northwest of Baghdad on the Tigris river . The town, with an estimated population in 2002 of about 260,000 is the administrative center of the Salah ad Din Governorate.-Ancient times:...

 and Mosul
Mosul
Mosul , is a city in northern Iraq and the capital of the Ninawa Governorate, some northwest of Baghdad. The original city stands on the west bank of the Tigris River, opposite the ancient Assyrian city of Nineveh on the east bank, but the metropolitan area has now grown to encompass substantial...

. In April 637, Hashim led 12,000 troops from Ctesiphon to win a victory over the Persians at the Battle of Jalula
Battle of Jalula
Battle of Jalula was fought between Sassanid Empire and Rashidun Caliphate soon after conquest of Ctesiphon.After the capturing Ctesiphon, several detachments were immediately sent to west to capture Qarqeesia and Heet the forts at the border of Byzantine empire...

. He then laid siege to Jalula for seven months. After seizing a victory at Jalula, Abdullah ibn Mutaam marched against Tikrit and captured the city after fierce resistance and with the help of Christians. He next sent an army to Mosul
Mosul
Mosul , is a city in northern Iraq and the capital of the Ninawa Governorate, some northwest of Baghdad. The original city stands on the west bank of the Tigris River, opposite the ancient Assyrian city of Nineveh on the east bank, but the metropolitan area has now grown to encompass substantial...

 which surrendered on the terms of the Jizya
Jizya
Under Islamic law, jizya or jizyah is a per capita tax levied on a section of an Islamic state's non-Muslim citizens, who meet certain criteria...

. With victory at Jalula and occupation of the Tikrit-Mosul region, Muslim rule in Mesopotamia was established.

After the conquest of Jalula, a Muslim force under Qa'qa marched in pursuit of the Persians. The Persian army that escaped from Jalaula took its position at Khaniqeen fifteen miles from Jalula on the road to Iran, under the command of General Mihran. Qa’qa defeated the Persian forces in the Battle of Khaniqeen and captured the city of Khaniqeen. The Persians withdrew to Hulwan
Hulwan, Iran
Hulwan is the name of an ancient city in the Zagros mountain range in present-day western Iran close to Kermanshah and the Diyala River. It was conquered by the Muslim Arab Armies in 638, and by Hulagu in 1257....

. Qaqa moved to Hulwan and laid siege to the city which was captured in January 638. Qa’qa sought permission for operating deeper into Persian land, i.e. main land Iran, but Caliph Umar didn’t approve the proposal and wrote a historic letter to Saad saying:

Raids of Persians in Mesopotamia (638–641)

By February 638 there was a lull in the fighting on the Persian front. The Suwad, the Tigris
Tigris
The Tigris River is the eastern member of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of southeastern Turkey through Iraq.-Geography:...

 valley, and the Euphrates
Euphrates
The Euphrates is the longest and one of the most historically important rivers of Western Asia. Together with the Tigris, it is one of the two defining rivers of Mesopotamia...

 valley were now under the complete control of the Muslims. The Persians had withdrawn to Persia proper
Iran
Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

, east of the Zagros mountains
Zagros Mountains
The Zagros Mountains are the largest mountain range in Iran and Iraq. With a total length of 1,500 km , from northwestern Iran, and roughly correlating with Iran's western border, the Zagros range spans the whole length of the western and southwestern Iranian plateau and ends at the Strait of...

. The Persians continued raiding Mesopotamia, which remained politically unstable. Nevertheless, it appeared as if this was going to be the dividing line between the Rashidun Caliphate
Rashidun Caliphate
The Rashidun Caliphate , comprising the first four caliphs in Islam's history, was founded after Muhammad's death in 632, Year 10 A.H.. At its height, the Caliphate extended from the Arabian Peninsula, to the Levant, Caucasus and North Africa in the west, to the Iranian highlands and Central Asia...

 and the Sassanids. In the later part of the year 638 Hormuzan
Hormuzan
Hormuzan was the satrap of Susiana, a noble and a Marzban as well as one of the spahbods at the Battle of al-Qādisiyyah. He was taken as prisoner by the Muslims.- Life :...

, who commanded one of the Persian corps at the Battle of Qadisiyyah and was one of the seven great chiefs of Persia, intensified his raids in Mesopotamia, Saad according to Umar’s instructions undertook offensive actions against Hormuzan and Utbah ibn Ghazwan aided by Nouman ibn Muqarin attacked Ahwaz and forced Hormuzan to enter into a peace treaty with the Muslims according to which Ahwaz would remain in Hormuzan’s possession and he would rule it as a vassal of the Muslims and would pay tribute. Hormuzan broke the treaty and revolted against the Muslims. Umar sent Abu Musa Ashaari, governor of Busra to deal with Hormuzan. Hormuzan was defeated and sought once again for peace. Umar accepted the offer and Hormuzan was again made vassal of the Muslims. This peace also proved short-lived once Hormuzan was reinforced by the fresh Persian troops sent by Emperor Yazdgerd III
Yazdgerd III
Yazdegerd III or Yazdgerd III was the twenty-ninth and last king of the Sassanid dynasty of Iran and a grandson of Khosrau II . His father was Shahryar, whose mother was Miriam, the daughter of the Byzantine Emperor Maurice...

 in late 640. The troops concentrated at Tuster north of Ahwaz. Umar sent Governor of Kufa
Kufa
Kufa is a city in Iraq, about south of Baghdad, and northeast of Najaf. It is located on the banks of the Euphrates River. The estimated population in 2003 was 110,000....

, Ammar ibn Yasir
Ammar ibn Yasir
ʻAmmār ibn Yāsir al-Ansi was one of the companions of the Islamic prophet Muhammad. He was one of the Muhajirun, and referred to as by Shia Muslims as one of the Four Companions....

, governor of Busra Abu Musa, and Nouman ibn Muqarin towards Tustar where Hormuzan was defeated, captured and sent to Madinah to Caliph Umar, where he apparently converted to Islam. He remained a useful adviser of Umar throughout the campaign of conquest of Persia. He is also considered to be the mastermind behind the assassination of Caliph Umar in 644. After the victory at Tustar, Abu Musa marched against Susa
Susa
Susa was an ancient city of the Elamite, Persian and Parthian empires of Iran. It is located in the lower Zagros Mountains about east of the Tigris River, between the Karkheh and Dez Rivers....

, a place of military importance, in January 641, which was captured after a siege of a couple of months. Next Abu Musa marched against Junde Sabur, the only place left of military importance in the Persian province of Khuzistan which surrendered to the Muslims after a siege of a few weeks.

Battle of Nahawand (641)

After the conquest of Khuzistan, the Caliph Umar wanted peace. Though considerably weakened, the image of the Persian Empire as a fearsome superpower still resonated in the minds of the newly-ascendant Arabs, and Umar was wary of unnecessary military engagement with the Persians. He wanted to leave the rest of Persia to the Persians. Umar said:

But the Persians thought differently. The pride of the imperial Persians had been hurt by the conquest of their land by the Arabs. They could not acquiesce in the occupation of their lands by the Arabs.

After the defeat of the Persian forces at the Battle of Jalula
Battle of Jalula
Battle of Jalula was fought between Sassanid Empire and Rashidun Caliphate soon after conquest of Ctesiphon.After the capturing Ctesiphon, several detachments were immediately sent to west to capture Qarqeesia and Heet the forts at the border of Byzantine empire...

 in 637, Emperor Yazdgerd III went to Rey
Rey, Iran
Rey or Ray , also known as Rhages and formerly as Arsacia, is the capital of Rey County, Tehran Province, Iran, and is the oldest existing city in the province....

 and from there moved to Merv
Merv
Merv , formerly Achaemenid Satrapy of Margiana, and later Alexandria and Antiochia in Margiana , was a major oasis-city in Central Asia, on the historical Silk Road, located near today's Mary in Turkmenistan. Several cities have existed on this site, which is significant for the interchange of...

 where he set up his capital. From Merv, he directed his chiefs to conduct continuous raids in Mesopotamia to destabilize the Muslim rule. Within the next four years, Yazdgerd III felt powerful enough to challenge the Muslims once again for the throne of Mesopotamia. The Emperor sent a call to his people to drive away the Muslims from their lands. In response to the call, hardened veterans and young volunteers from all parts of Persia marched in large numbers to join the imperial standard and marched to Nihawand for the last titanic struggle between the forces of the Caliphate and Sassanid Persia. 50,000 Persian fighters assembled, commanded by Mardan Shah.

The Governor of Kufa
Kufa
Kufa is a city in Iraq, about south of Baghdad, and northeast of Najaf. It is located on the banks of the Euphrates River. The estimated population in 2003 was 110,000....

, Ammar ibn Yasir
Ammar ibn Yasir
ʻAmmār ibn Yāsir al-Ansi was one of the companions of the Islamic prophet Muhammad. He was one of the Muhajirun, and referred to as by Shia Muslims as one of the Four Companions....

, received intelligence of the Persian movements and concentration at Nihawand. He reported the matter to Umar. Although Umar had expressed a desire for Mesopotamia to be his easternmost frontier, he felt compelled to act given the concentration of the Persian army at Nihawand. He believed that so long as Persia proper remained under Sassanid rule, Persian forces would continue raiding Mesopotamia with a view to one day recapturing the region. Hudheifa ibn Al Yaman was appointed commander of the forces of Kufa, and was ordered to march to Nihawand. Governor of Busra Abu Musa, was to march to Nihawand commanding his forces of Busra Nouman ibn Muqarrin
Nouman ibn Muqarrin
An-Numan ibn Muqarrin was a companion of Muhammad. He was the leader of the tribe of Banu Muzaynah. The tribe of Banu Muzaynah had their habitations some distance from Yathrib on the caravan route which linked the city to Makkah.-During the Caliphate of Abu Bakr and Umar:An-Numan had several...

 marched from Ctesiphon to Nihawand while Umar decided to lead the army concentrated at Madinah in person and command the Muslims at the battle. Umar's decision to command the army in person was not well received by the members of Majlis al Shura
Majlis al Shura
Majlis al Shura is a transliteration of the Arabicمجلس الشورىwhich means approximately "consultative council", although it has been co-opted as a term for Parliament or Advisory Council. Its pronunciation is approximately "majlis ash-shura"....

 at Madinah. It was suggested that Umar should command the campaign from Madinah, and should appoint an astute military commander to lead the Muslims at Nihawand. Umar appointed Mugheera ibn Shuba as commander of the forces concentrated at Madinah and appointed Nouman ibn Muqarrin as commander in chief of the Muslims at Nihawand. The Muslim army left for Nihawand and first concentrated at Tazar, and then moved to Nihawand and defeated the Persian forces at the Battle of Nihawand
Battle of Nihawand
The Battle of Nahāvand Battle of Nahāwand was fought in 642 between Arab Muslims and Sassanid armies. The battle is known to Muslims as the "Victory of Victories." The History of Tabari mentions that Firuzan, the officer serving the Persian King Yazdgerd III had about 50,000 men, versus a Muslim...

 in December 641. Nouman died in action, and as per Umar's instructions Hudheifa ibn Al Yaman became new commander in chief. After the victory at Nihawand, the Muslim army captured the whole district of Hamadan
Hamadan
-Culture:Hamadan is home to many poets and cultural celebrities. The city is also said to be among the world's oldest continuously inhabited cities.Handicrafts: Hamadan has always been well known for handicrafts like leather, ceramic, and beautiful carpets....

 after feeble resistance by the Persians.

Conquest of Persia (642–644)

After years of no fighting, Umar
Umar
`Umar ibn al-Khattāb c. 2 November , was a leading companion and adviser to the Islamic prophet Muhammad who later became the second Muslim Caliph after Muhammad's death....

 now adopted a new offensive policy. The whole-scale invasion of the Sassanid Empire was to begin. The Battle of Nihawand
Battle of Nihawand
The Battle of Nahāvand Battle of Nahāwand was fought in 642 between Arab Muslims and Sassanid armies. The battle is known to Muslims as the "Victory of Victories." The History of Tabari mentions that Firuzan, the officer serving the Persian King Yazdgerd III had about 50,000 men, versus a Muslim...

 was one of the most decisive battles in Islamic history. The battle proved to be the key to Persia. After the devastating defeat at Nihawand, the last Sassanid emperor, Yazdgerd III, was never able again to raise more troops to resist Umar. It had now become a war between two rulers. Umar would follow Yazdgerd III to every corner of his empire in order to kill or capture him, like he did with Hormuzan
Hormuzan
Hormuzan was the satrap of Susiana, a noble and a Marzban as well as one of the spahbods at the Battle of al-Qādisiyyah. He was taken as prisoner by the Muslims.- Life :...

. Yazdgerd III had a narrow escape at Marv
Marv
Marv is a fictional character in the graphic novel series Sin City, created by Frank Miller. In the 2005 film adaptation, he is played by Mickey Rourke. He first appears in The Hard Goodbye and follows with appearances in A Dame to Kill For, Just Another Saturday Night, and Silent Night...

 when Umar’s lieutenant was about to capture him. He saved his life by fleeing to China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, far enough from the reach of Umar. In this way, the 400-year-old Sassanid dynasty ultimately ended. The conquest of the Sassanid Empire was the greatest triumph of Umar, because he commanded the operations 1000 kilometers away from the battlefields and it marked his reputation as one of the greatest military and political geniuses of all time, like his late cousin Khalid ibn Walid (590–642) had proven to be.

Strategic planning for the conquest of Persia

Umar decided to strike the Persians immediately after their defeat at Nihawand, when he had gained a psychological advantage over them. The main strategic problem for Umar was from where to start the offensive. There were three alternatives: Fars in the south, Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

 in the north or Isfahan in the center. Umar chose Isfahan to be the first target. His strategy was to strike the heart of the Persian Empire. This would cut off the supply lines and communication lines of the Sassanid garrisons from the rest of the Persian provinces. In other words, an attack on Isfahan would isolate Fars and Azerbaijan from Khurasan. After having captured the heartland of Persia, that is Fars and Isfahan, the next attacks would be simultaneously launched against Azerbaijan, the North Western province, and Sistan
Sistan
Sīstān is a border region in eastern Iran , southwestern Afghanistan and northern tip of Southwestern Pakistan .-Etymology:...

, the most eastern province of the Persian Empire. The conquest of those provinces would leave Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

, the stronghold of Emperor Yazdegerd III, isolated and vulnerable.

In the last phase of this grand campaign, Khurasan was to be attacked. This would be the last nail in the coffin of the Sassanid dynasty. The plan was formulated and preparations were completed by January 642. The success of plan depended upon how brilliantly Umar would be able to coordinate these attacks from Madinah, about 1000 miles from the battlefields in Persia and upon the skills and abilities of his field commanders. Umar appointed his best field commanders to conquer the Sassanid Empire and bring down his most formidable foe, Yazdegerd III. The campaign saw a different pattern in command structure. Umar did not appoint a single field commander to campaign across the Persian lands. He rather appointed several commanders, each with his own objectives, and once the mission was over he would act as an ordinary subordinate under the new field commander for the next mission. This was done by Umar to prevent any of his commanders from gaining prominence and power that could in the future threaten his own authority.

In 638, he feared Khalid’s growing power and popularity and dismissed him from military services when he was at the zenith of his military career. At the time of his dismissal, Khalid was more than able to rebel against Umar, but he never rebelled and made a soft corner in Umar’s heart. In 642 at the eve of the conquest of Persia, Umar, wanting to give a moral boost to his troops, decided to reinstall Khalid as new field commander against Persia. Already well reputed as an invincible military commander and conqueror of the Eastern provinces of the Roman Empire, Khalid’s presence in Persia would strike terror in the Persian commanders, most of whom had already faced Khalid in 633 during his lightning conquest of Mesopotamia.

Umar wanted a sure victory in the early campaigns, which would increase the confidence of his troops and meanwhile demoralize the Persians. Before Umar could issue orders of reappointment, Khalid, residing in Emesa, died. In various campaigns in Persia, Umar even appointed the commanders of the wings, the center and the cavalry
Cavalry
Cavalry or horsemen were soldiers or warriors who fought mounted on horseback. Cavalry were historically the third oldest and the most mobile of the combat arms...

 of the army. Umar strictly instructed his commanders to consult him before making any decisive move in Persia. All the commanders, before starting their assigned campaigns, were instructed to send a detailed report of the geography and terrain of the region and the position of the Persian garrison
Garrison
Garrison is the collective term for a body of troops stationed in a particular location, originally to guard it, but now often simply using it as a home base....

s, forts, cities and troops in it. Umar then would send them a detailed plan of how he wanted this region to be captured. Only the tactical issues were left to the field commanders to be tackled in accordance with the situation they faced at their fronts. Umar appointed the best available and well reputed commanders for the campaign.

Conquest of Central Persia (Isfahan and Tabaristan)

The preparation and planning of the conquest of the Persian Empire was completed by early 642. Umar appointed Abdullah ibn Uthban, commander of the Muslim forces, to invade Isfahan. From Nihawand, Abdullah marched to Hamadan
Hamadan
-Culture:Hamadan is home to many poets and cultural celebrities. The city is also said to be among the world's oldest continuously inhabited cities.Handicrafts: Hamadan has always been well known for handicrafts like leather, ceramic, and beautiful carpets....

, which was already in Muslim hands. From Hamadan, Abdullah marched northeast to Rey, Iran
Rey, Iran
Rey or Ray , also known as Rhages and formerly as Arsacia, is the capital of Rey County, Tehran Province, Iran, and is the oldest existing city in the province....

, about 200 miles from Hamadan, and laid siege to the city, which surrendered after fierce resistance. Once Rey was captured, Abdullah marched 230 miles southeast against the city Isfahan and laid siege to it; there the Muslim army was reinforced by fresh troops from Busra and Kufa under the command of Abu Musa Ashaari and Ahnaf ibn Qais. The siege continued for a few months and finally the city surrendered. From Isfahan, Abdullah again marched 150 miles northeast towards Qom
Qom
Qom is a city in Iran. It lies by road southwest of Tehran and is the capital of Qom Province. At the 2006 census, its population was 957,496, in 241,827 families. It is situated on the banks of the Qom River....

, which was captured without much resistance. This was the outermost boundary of the Isfahan region. Further northeast of it was Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

, and southeast of it lay Sistan
Sistan
Sīstān is a border region in eastern Iran , southwestern Afghanistan and northern tip of Southwestern Pakistan .-Etymology:...

. Meanwhile, Hamadan and Rey had rebelled. Umar sent Naiem ibn Muqarrin, brother of late Nauman ibn Muqarrin, who was the Muslim commander at Nihawand, to crush the rebellion and to clear the westernmost boundaries of Isfahan. Naiem marched towards Hamadan from Isfahan. A bloody battle was fought and Hamadan was recaptured by the Muslims. Naiem next moved to Rey. There too the Persians resisted and were defeated outside the fort, and the city was recaptured by the Muslims. The Persian citizens sought for peace and agreed to pay the Jizya
Jizya
Under Islamic law, jizya or jizyah is a per capita tax levied on a section of an Islamic state's non-Muslim citizens, who meet certain criteria...

. From Rey, Naiem moved north towards Tabaristan, which lay south of the Caspian Sea
Caspian Sea
The Caspian Sea is the largest enclosed body of water on Earth by area, variously classed as the world's largest lake or a full-fledged sea. The sea has a surface area of and a volume of...

. The ruler of Tabaristan surrendered and a peace treaty was signed according to which he would govern Tabaristan on behalf of the Caliph and would pay annually the Jizya. This was all done in April 642. Naiem’s brother advanced further north and captured Qumas, Jarjan and Amol
Amol
Amol is a city in and the capital of Amol County, Mazandaran Province, Iran. At the 2006 census, its population was 197,470, in 55,183 families.Amol and the old part of town is the first of the four towns that populate the world in which there is Nzamyh...

. He too signed a peace treaty with the locals according to which they accepted Muslim rule over the area and would pay the Jizya. With this campaign that ended some time in 643, the Muslims were master of Tabaristan. Further North West of the region lay Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

.

Conquest of Southern Persia (Fars)

With Isfahan firmly in Muslim hands, the conquest of Fars began about the same time that the conquest of Tabaristan was started. The first army to penetrate Fars was under the command of Maja’a ibn Masood. His objective was Sabur. Maja’a marched from Busra to Tawwaj, where Persian forces halted his forces and were defeated in a quick battle that followed. From Tawwaj, Maja’a moved to Sabur, which was a fortified town. The siege continued for a few weeks, after which the city surrendered and the usual terms of the Jizya were enforced upon it. With the conquest of Sabur Maja’a, ibn Masood’s mission was over. Reinforcement came under the command of Usman ibn Abi al-Aas, who took over the command of Majaa’s army. Usman’s objective was the ancient Persian capital city of Persepolis
Persepolis
Perspolis was the ceremonial capital of the Achaemenid Empire . Persepolis is situated northeast of the modern city of Shiraz in the Fars Province of modern Iran. In contemporary Persian, the site is known as Takht-e Jamshid...

. Usman marched from Tawwaj to Shiraz
Shiraz
Shiraz may refer to:* Shiraz, Iran, a city in Iran* Shiraz County, an administrative subdivision of Iran* Vosketap, Armenia, formerly called ShirazPeople:* Hovhannes Shiraz, Armenian poet* Ara Shiraz, Armenian sculptor...

, which surrendered peacefully. From Shiraz, Usman moved 35 miles north to Persepolis and laid siege to the historic Persian city. The siege lasted for several weeks before the city surrendered. Usman’s mission was over at Persepolis. Here again a change of command occurred. The mission to capture the eastern districts of Fasa
Fasa
Fasa is a city in and the capital of Fasa County, Fars Province, Iran. At the 2006 census, its population was 90,251, in 22,097 families.-Colleges and universities:*# *# *# *#...

 and Darab
Darab
Darab is a city in and the capital of Darab County, Fars Province, Iran. At the 2006 census, its population was 54,513, in 13,279 families.Around Darab are a lot of villages such as Tizab, Nasravan, Barab.-Historical background:...

 was given to Sariyah ibn Zuneim, who moved 80 miles southeast to capture Fasa and then Darab, 60 miles from Fasa after resistance from local Persian garrisons. With this last successful expedition, the conquest of Fars was completed by late 642. Further east of Fars lay Kerman
Kerman
- Geological characteristics :For the Iranian paleontologists, Kerman has always been considered a fossil paradise. Finding new dinosaur footprints in 2005 has now revealed new hopes for paleontologists to better understand the history of this area.- Economy :...

 and Sistan
Sistan
Sīstān is a border region in eastern Iran , southwestern Afghanistan and northern tip of Southwestern Pakistan .-Etymology:...

. A simultaneous campaign was launched against eastern (Sistan and Balochistan), southern (Kerman and Makran) and north western (Azerbaijan) Persia.

Conquest of Southeastern Persia (Kerman and Makran)

The expedition to Kerman
Kerman
- Geological characteristics :For the Iranian paleontologists, Kerman has always been considered a fossil paradise. Finding new dinosaur footprints in 2005 has now revealed new hopes for paleontologists to better understand the history of this area.- Economy :...

 was sent roughly at the same time when the expeditions to Sistan
Sistan
Sīstān is a border region in eastern Iran , southwestern Afghanistan and northern tip of Southwestern Pakistan .-Etymology:...

 and Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

 were sent. Suhail ibn adi was given command of this expedition. Suhail marched from Busra in 643; passing from Shiraz
Shiraz
Shiraz may refer to:* Shiraz, Iran, a city in Iran* Shiraz County, an administrative subdivision of Iran* Vosketap, Armenia, formerly called ShirazPeople:* Hovhannes Shiraz, Armenian poet* Ara Shiraz, Armenian sculptor...

 and Persepolis
Persepolis
Perspolis was the ceremonial capital of the Achaemenid Empire . Persepolis is situated northeast of the modern city of Shiraz in the Fars Province of modern Iran. In contemporary Persian, the site is known as Takht-e Jamshid...

 he joined with other Muslim armies and marched against Kerman, which was subdued after a pitched battle with local garrisons. Further east of Kerman lay Makran
Makran
The present day Makran is a semi-desert coastal strip in the south of Sindh, Balochistan, in Iran and Pakistan, along the coast of the Arabian Sea and the Gulf of Oman. The present day Makran derived its name from Maka, a satrap of Achaemenid Empire....

 in what is now a part of present-day Pakistan
Pakistan
Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

. It was the domain of the Hindu
Hindu
Hindu refers to an identity associated with the philosophical, religious and cultural systems that are indigenous to the Indian subcontinent. As used in the Constitution of India, the word "Hindu" is also attributed to all persons professing any Indian religion...

 king of Rasil (sindh). The Rai Dynasty
Rai Dynasty
The Rai Dynasty was an Aryan dynasty of Sindh, from c. 489–690 AD. The influence of the Rai empire extended from Kashmir in the east, Makran and Debal port in the west, Surat port in south, Kandahar, Sistan, Suleyman, Ferdan and Kikanan hills in the north, ruling an area of over 600,000...

 dominions were vast, extending from Kashmir and Kanauj to Kandhar and Seistan and on the west to Mekran and a part of Debal, while on the south to Surat their capital was Alor
Alor
Alor is the largest island in the Alor Archipelago located at the eastern-most end of the Lesser Sunda Islands that runs through southern Indonesia, which from the west include such islands as Bali, Lombok, Sumbawa, Komodo, and Flores....

 and during their rule Sindh was divided into four provinces: Bahmanabad, Siwistan, Chachpur (which comprised the greater part of Bahaw'alpur Division) and the province consisting of Multan and West Punjab. The Raja
Raja
Raja is an Indian term for a monarch, or princely ruler of the Kshatriya varna...

 of Rasil concentrated huge armies from Sindh and Balochistan
Balochistan (region)
Balochistan or Baluchistan is an arid, mountainous region in the Iranian plateau in Southwest Asia; it includes part of southeastern Iran, western Pakistan, and southwestern Afghanistan. The area is named after the numerous Baloch tribes, Iranian peoples who moved into the area from the west...

 to halt the advance of the Muslims. Suhail was reinforced by Usman ibn Abi Al Aas from Persepolis, and Hakam ibn Amr from Busra. The combined forces defeated Raja Rasil at the Battle of Rasil
Battle of Rasil
Battle of Rasil was fought between Rai Kingdom of Sindh and Rashidun Caliphate in early 644. It was first encounter of Rashidun Caliphate with Indian subcontinent...

, who retreated to the eastern bank of the River Indus. Further east from the Indus River laid Sindh
Sindh
Sindh historically referred to as Ba'ab-ul-Islam , is one of the four provinces of Pakistan and historically is home to the Sindhi people. It is also locally known as the "Mehran". Though Muslims form the largest religious group in Sindh, a good number of Christians, Zoroastrians and Hindus can...

. Umar, after knowing that Sindh was a poor and relatively barren land, disapproved Suhail’s proposal to cross the Indus River. For the time being, Umar declared the Indus River, a natural barrier, to be the eastern most frontier of his domain. This campaign came to an end in mid 644.

Conquest of Eastern Persia (Sistan)

Sistan
Sistan
Sīstān is a border region in eastern Iran , southwestern Afghanistan and northern tip of Southwestern Pakistan .-Etymology:...

 was believed to be the largest province of the Sassanid Empire. In the south it bordered with Kerman and in the north with Khurasan. It stretched from what is now Balochistan, Pakistan
Balochistan (Pakistan)
Balochistan is one of the four provinces or federating units of Pakistan. With an area of 134,051 mi2 or , it is the largest province of Pakistan, constituting approximately 44% of the total land mass of Pakistan. According to the 1998 population census, Balochistan had a population of...

 in the east and southern Afghanistan
Afghanistan
Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

 in the north. Asim ibn Amr, veteran of the great battles of Qadisiyyah and Nihawand
Battle of Nihawand
The Battle of Nahāvand Battle of Nahāwand was fought in 642 between Arab Muslims and Sassanid armies. The battle is known to Muslims as the "Victory of Victories." The History of Tabari mentions that Firuzan, the officer serving the Persian King Yazdgerd III had about 50,000 men, versus a Muslim...

, was appointed to conquer Sistan. Asim marched from Busra, and passing through Fars and taking under his command the Muslim troops already present in Fars, entered Sistan. No resistance was offered and cities surrendered. Asim reached Zaranj
Zaranj
Zaranj or Zarang is a border town in south-western Afghanistan, with a population of approximately 49,851 people as of 2004. It is the capital of Nimruz province and is situated next to Milak, Iran. It is linked by highways with Lashkar Gah to the east, Farah to the north and Zabol in Iran to the...

, 250 miles from Kandahar
Kandahar
Kandahar is the second largest city in Afghanistan, with a population of about 512,200 as of 2011. It is the capital of Kandahar Province, located in the south of the country at about 1,005 m above sea level...

, a small town in present-day southern Afghanistan, then a bustling capital of Sistan. Asim laid siege to the city which lasted several months. A pitched battle was fought outside the city and the Persians were defeated and routed. With the surrender of Zaranj, Sistan submitted to Muslim rule. Further east of Sistan was northern Sindh
Sindh
Sindh historically referred to as Ba'ab-ul-Islam , is one of the four provinces of Pakistan and historically is home to the Sindhi people. It is also locally known as the "Mehran". Though Muslims form the largest religious group in Sindh, a good number of Christians, Zoroastrians and Hindus can...

, which was beyond the scope of the mission assigned to Asim. The Caliph, for the time being, didn’t approve of any incursion in the land east of the Persian Empire and ordered his men to consolidate power in the newly conquered land.

Conquest of Azerbaijan

The conquest of Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

 started in 643. It was part of a simultaneous attack launched against the north, south and east of Persia, after capturing Isfahan and Fars. These brilliantly coordinated multi-pronged attacks by Caliph Umar paralyzed the whole of what then remained of the Persian Empire. Expeditions were sent against Kerman and Makran in the southeast, against Sistan in the northeast and against Azerbaijan in the northwest. Hudheifa ibn Al Yaman was appointed commander to conquer Azerbaijan. Hudheifa marched from Rey in central Persia to Zanjan
Zanjan
Zanjan may refer to:* Zanjan Province, Iran* Zanjan County, an area within Zanjan Province* Zanjan, Iran, the capital of Zanjan County and Zanjan Province* Zanjan University, located in the city of Zanjan* Senjan, a city in Markazi Province, Iran...

, a stronghold of the Persians in the north. Zanjan was a well defended fortified town. The Persians came out of the city and gave battle. Hudheifa defeated the Persian garrison and captured the city, and according to Caliph Umar’s order, the civilians who sought for peace were given peace on the usual terms of the Jizya
Jizya
Under Islamic law, jizya or jizyah is a per capita tax levied on a section of an Islamic state's non-Muslim citizens, who meet certain criteria...

. From Zanjan, Hudheifa marched to Ardabil
Ardabil
Ardabil is a historical city in north-western Iran. The name Ardabil probably comes from the Zoroastrian name of "Artavil" which means a holy place. Ardabil is the center of Ardabil Province. At the 2006 census, its population was 412,669, in 102,818 families...

 which surrendered peacefully and Hudheifa continued his march north along the western coast of the Caspian Sea
Caspian Sea
The Caspian Sea is the largest enclosed body of water on Earth by area, variously classed as the world's largest lake or a full-fledged sea. The sea has a surface area of and a volume of...

 and captured Bab
Bab
Bab can refer to:* Bab, Set, Seth, ancient Egyptian god* Bāb, a Semitic word meaning gateway* Báb , founder of Bábism and a central figure in the Bahá'í Faith...

 by force. At this point Hudheifa was recalled by Caliph umar. Bukair ibn Abdullah and Utba ibn Farqad succeeded him. They were sent to carry out a two pronged attack against Azerbaijan. Bukair was to march north along the western coast of the Caspian Sea while Uthba was to march directly into the heart of Azerbaijan. On his way north Bukair was halted by a large Persian force under Isandir. A pitched battle was fought and Isandir was defeated and captured. Isandir in return for the safety of his life agreed to surrender his estates in Azerbaijan and persuade others toward submission to Muslim rule. Uthba ibn Farqad defeated Bahram, brother of Isandir. He too sought for peace. A pact was drawn according to which Azerbaijan was surrendered to Caliph Umar on usual terms of paying the annual Jizya
Jizya
Under Islamic law, jizya or jizyah is a per capita tax levied on a section of an Islamic state's non-Muslim citizens, who meet certain criteria...

. The expedition commenced some time in late 643.

Conquest of Armenia

Byzantine
Byzantine
Byzantine usually refers to the Roman Empire during the Middle Ages.Byzantine may also refer to:* A citizen of the Byzantine Empire, or native Greek during the Middle Ages...

 Armenia
Armenia
Armenia , officially the Republic of Armenia , is a landlocked mountainous country in the Caucasus region of Eurasia...

 was already conquered in 638–639. Persian Armenia lay north of Azerbaijan. By now, except for Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

 and Armenia
Armenia
Armenia , officially the Republic of Armenia , is a landlocked mountainous country in the Caucasus region of Eurasia...

, the whole of the Persian Empire was under Umar’s control and Emperor Yazdegred III was on the run. However, Umar refused to take any chances; he never perceived the Persians as being weak and weary. The fact that Umar didn't underestimate the Persians is the secret behind the brilliant and speedy conquest of the Persian Empire. Again Umar decided to send simultaneous expeditions to the far north-east and north-west of the Persian Empire. An expedition was sent to Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

 in late 643 and at the same time an expedition was launched against Armenia
Armenia
Armenia , officially the Republic of Armenia , is a landlocked mountainous country in the Caucasus region of Eurasia...

.
Bukair ibn Abdullah, who had recently subdued Azerbaijan, was assigned a mission to capture Tiflis, the present day capital of Georgia
Georgia (country)
Georgia is a sovereign state in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded to the west by the Black Sea, to the north by Russia, to the southwest by Turkey, to the south by Armenia, and to the southeast by Azerbaijan. The capital of...

, then a Capital of Persian Armenia. From Bab
Bab
Bab can refer to:* Bab, Set, Seth, ancient Egyptian god* Bāb, a Semitic word meaning gateway* Báb , founder of Bábism and a central figure in the Bahá'í Faith...

 at the western coast of the Caspian Sea, Bukair continued his march north. Umar decided to practice his traditional and successful strategy of multi-pronged attacks. While Bukair was still miles away from Tiflis, Umar instructed him to divide his army into three corps. Umar appointed Habib ibn Muslaima to capture Tiflis, Abdulrehman to march north against the mountains and Hudheifa to march against the southern mountains. Habib captured Tiflis and the region up to the eastern coast of the Black Sea
Black Sea
The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

. Abdulrehman marched north to the Caucasus Mountains
Caucasus
The Caucasus, also Caucas or Caucasia , is a geopolitical region at the border of Europe and Asia, and situated between the Black and the Caspian sea...

 and subdued the tribes. Hudheifa marched south-west to the mountainous region and subdued the local tribes. The advance into Armenia came to an end with the death of Caliph Umar in November 644. By then almost the whole of the South Caucasus
Caucasus
The Caucasus, also Caucas or Caucasia , is a geopolitical region at the border of Europe and Asia, and situated between the Black and the Caspian sea...

 was captured.

Conquest of Khurasan

Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

 was the second largest province of the Sassanid Empire. It stretched from what is now northeastern Iran
Iran
Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

, northwestern Afghanistan
Afghanistan
Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

 and southern Turkmenistan
Turkmenistan
Turkmenistan , formerly also known as Turkmenia is one of the Turkic states in Central Asia. Until 1991, it was a constituent republic of the Soviet Union, the Turkmen Soviet Socialist Republic . Turkmenistan is one of the six independent Turkic states...

. Its capital was Balkh
Balkh
Balkh , was an ancient city and centre of Zoroastrianism in what is now northern Afghanistan. Today it is a small town in the province of Balkh, about 20 kilometers northwest of the provincial capital, Mazar-e Sharif, and some south of the Amu Darya. It was one of the major cities of Khorasan...

, in northern Afghanistan. In late 643 the mission of conquering Khurasan was assigned to Ahnaf ibn Qais. Ahnaf marched from Kufa
Kufa
Kufa is a city in Iraq, about south of Baghdad, and northeast of Najaf. It is located on the banks of the Euphrates River. The estimated population in 2003 was 110,000....

 and took a short and less frequented route via Rey
Rey, Iran
Rey or Ray , also known as Rhages and formerly as Arsacia, is the capital of Rey County, Tehran Province, Iran, and is the oldest existing city in the province....

 and Nishapur
Nishapur
Nishapur or Nishabur , is a city in the Razavi Khorasan province in northeastern Iran, situated in a fertile plain at the foot of the Binalud Mountains, near the regional capital of Mashhad...

. Rey was already in Muslim hands and Nishapur surrendered without resistance. From Nishapur Ahnaf marched to Herat
Herat
Herāt is the capital of Herat province in Afghanistan. It is the third largest city of Afghanistan, with a population of about 397,456 as of 2006. It is situated in the valley of the Hari River, which flows from the mountains of central Afghanistan to the Karakum Desert in Turkmenistan...

 which is in western Afghanistan. Herat was a fortified town, the Siege of Herat
Siege of Herat
A siege of Herat refers to a protracted conflict against the city of Herat in Afghanistan, considered strategic in several military campaigns.These include:* Siege of Herat , part of the Islamic conquest of Sassanid Persia...

 lasted for a few months before surrendering. With the surrender of Herat, the whole of southern Khurasan came under Muslim control. With Herat under his firm control, Ahnaf marched north directly to Merv
Merv
Merv , formerly Achaemenid Satrapy of Margiana, and later Alexandria and Antiochia in Margiana , was a major oasis-city in Central Asia, on the historical Silk Road, located near today's Mary in Turkmenistan. Several cities have existed on this site, which is significant for the interchange of...

, in present Turkmenistan
Turkmenistan
Turkmenistan , formerly also known as Turkmenia is one of the Turkic states in Central Asia. Until 1991, it was a constituent republic of the Soviet Union, the Turkmen Soviet Socialist Republic . Turkmenistan is one of the six independent Turkic states...

. Merv was the capital of Khurasan and here Yazdegred III held his court. On hearing of the Muslim advance, Yazdegred III left for Balkh. No resistance was offered at Merv, and the Muslims occupied the capital of Khurasan without firing a shot. Ahnaf stayed at Merv and waited for reinforcement from Kufa. Meanwhile Yazdgird had also gathered considerable power at Balkh and also sought alliance with the Khan of Farghana, who personally led the Turkish contingent to help Yazdegred III. Umar ordered that Yazdgird’s allied forces should be weaken by breaking up the alliance with the Turks. Ahnaf successfully broke up the alliance and the Khan of Farghana pulled back his forces realizing that fighting with the Muslims was not a good idea and that it might endanger his own kingdom. Yazdgird's army was defeated at the Battle of Oxus River
Battle of Oxus River
The Battle of Oxus River was a significant battle in the 7th century, fought between the armies of the Sassanid Empire and the Muslim Arab army that had overrun Persia. Following his defeat, the last Sassanid Emperor, Yazdegerd III, became a hunted fugitive who fled to Central Asia and then to...

 and retreated across the Oxus to Transoxiana
Transoxiana
Transoxiana is the ancient name used for the portion of Central Asia corresponding approximately with modern-day Uzbekistan, Tajikistan, southern Kyrgystan and southwest Kazakhstan. Geographically, it is the region between the Amu Darya and Syr Darya rivers...

. Yazdegred III had a narrow escape and fled to China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

. Balkh was occupied by the Muslims, and with this occupation the Persian war was over. The Muslims had now reached the outermost frontiers of Persia. Beyond that lay the lands of the Turks
Turkic peoples
The Turkic peoples are peoples residing in northern, central and western Asia, southern Siberia and northwestern China and parts of eastern Europe. They speak languages belonging to the Turkic language family. They share, to varying degrees, certain cultural traits and historical backgrounds...

 and still further lay China. The old mighty empire of the Sassanids had ceased to exist. Ahnaf returned to Marv and sent a detail report of operations to Umar, a historic letter Umar was anxiously waiting for, subject of which was the downfall of the Persian Empire, and with which permission was sought to cross the Oxus river and invade Transoxiana. Umar ordered Ahnaf to desist and instead to consolidate his power south of Oxus.

Persian rebellion

Caliph Umar was assassinated in November 644 by a Persian slave. The assassination is often seen by various historians as a Persian conspiracy against Umar. Hormuzan
Hormuzan
Hormuzan was the satrap of Susiana, a noble and a Marzban as well as one of the spahbods at the Battle of al-Qādisiyyah. He was taken as prisoner by the Muslims.- Life :...

 is said to have masterminded this plot. Caliph Uthman ibn Affan (644–656) succeeded Umar. During his reign almost the whole of the former Sassanid empire's territory rebelled from time to time until 651, until the last Sassanid emperor was assassinated near Merv
Merv
Merv , formerly Achaemenid Satrapy of Margiana, and later Alexandria and Antiochia in Margiana , was a major oasis-city in Central Asia, on the historical Silk Road, located near today's Mary in Turkmenistan. Several cities have existed on this site, which is significant for the interchange of...

 ending the Sassanid dynasty and Persian resistance to the Muslims. Caliph Uthman therefore had to send several military expeditions to crush the rebellions and recapture Persia and their vassal states. The Empire expanded beyond the borders of the Sassanid Empire in Transoxiana
Transoxiana
Transoxiana is the ancient name used for the portion of Central Asia corresponding approximately with modern-day Uzbekistan, Tajikistan, southern Kyrgystan and southwest Kazakhstan. Geographically, it is the region between the Amu Darya and Syr Darya rivers...

, Baluchistan
Balochistan (region)
Balochistan or Baluchistan is an arid, mountainous region in the Iranian plateau in Southwest Asia; it includes part of southeastern Iran, western Pakistan, and southwestern Afghanistan. The area is named after the numerous Baloch tribes, Iranian peoples who moved into the area from the west...

 and the Caucasus
Caucasus
The Caucasus, also Caucas or Caucasia , is a geopolitical region at the border of Europe and Asia, and situated between the Black and the Caspian sea...

. The main rebellion was in the Persian provinces of Armenia, Azerbaijan, Fars, Sistan ( in 649), Tabaristan, Khorasan (651), and Makran (650).

End of the Sassanid dynasty

Yazdegerd III, after being defeated at the Battle of Oxus river
Battle of Oxus River
The Battle of Oxus River was a significant battle in the 7th century, fought between the armies of the Sassanid Empire and the Muslim Arab army that had overrun Persia. Following his defeat, the last Sassanid Emperor, Yazdegerd III, became a hunted fugitive who fled to Central Asia and then to...

 in 644 CE/AD, was unable to raise another army and became a hunted fugitive.
Following the battle he fled to Central Asia
Central Asia
Central Asia is a core region of the Asian continent from the Caspian Sea in the west, China in the east, Afghanistan in the south, and Russia in the north...

 to the court of the Khan of Farghana. From there Yazdegerd went to China. Nevertheless Yazdegerd III kept on returning to Persia to exert his influence over the notables and chiefs of Persia. He thus remained a motivating force behind the Persian rebellion. During Caliph Uthman's reign Yazdegerd III came back to Bactria
Bactria
Bactria and also appears in the Zend Avesta as Bukhdi. It is the ancient name of a historical region located between south of the Amu Darya and west of the Indus River...

 and Khurasan
Greater Khorasan
Greater Khorasan or Ancient Khorasan is a historical region of Greater Iran mentioned in sources from Sassanid and Islamic eras which "frequently" had a denotation wider than current three provinces of Khorasan in Iran...

 rebelled against the Caliphate. Abdullah ibn Aamir
Abdullah ibn Aamir
Abdullah ibn Aamir was a governor of Busra and an extremely successful military general during the reign of Rashidun Caliph Uthman ibn Affan. He is well known for his administrative and military prowess.-Early life:...

 crushed the rebellion and defeated Yazdegerd's forces. He fled from one district to another until a local miller killed him for his purse at Merv
Merv
Merv , formerly Achaemenid Satrapy of Margiana, and later Alexandria and Antiochia in Margiana , was a major oasis-city in Central Asia, on the historical Silk Road, located near today's Mary in Turkmenistan. Several cities have existed on this site, which is significant for the interchange of...

 in 651. For many decades to come, this was the easternmost limit of Muslim rule.

Persia under Muslim rule

According to Bernard Lewis
Bernard Lewis
Bernard Lewis, FBA is a British-American historian, scholar in Oriental studies, and political commentator. He is the Cleveland E. Dodge Professor Emeritus of Near Eastern Studies at Princeton University...

:
"Arab Muslims conquests have been variously seen in Iran: by some as a blessing, the advent of the true faith, the end of the age of ignorance and heathenism; by others as a humiliating national defeat, the conquest and subjugation of the country by foreign invaders. Both perceptions are of course valid, depending on one's angle of vision… Iran was indeed Islamized, but it was not Arabized. Persians remained Persians. And after an interval of silence, Iran reemerged as a separate, different and distinctive element within Islam, eventually adding a new element even to Islam itself. Culturally, politically, and most remarkable of all even religiously, the Iranian contribution to this new Islamic civilization is of immense importance. The work of Iranians can be seen in every field of cultural endeavor, including Arabic poetry, to which poets of Iranian origin composing their poems in Arabic made a very significant contribution. In a sense, Iranian Islam is a second advent of Islam itself, a new Islam sometimes referred to as Islam-i Ajam. It was this Persian Islam, rather than the original Arab Islam, that was brought to new areas and new peoples: to the Turks, first in Central Asia and then in the Middle East in the country which came to be called Turkey, and of course to India. The Ottoman Turks brought a form of Iranian civilization to the walls of Vienna."

Administration

Under Umar and his immediate successors, the Arab conquerors attempted to maintain their political and cultural cohesion despite the attractions of the civilizations they had conquered. The Arabs initially settled in the garrison towns rather than on scattered estates.
The new non-Muslim subjects were protected by the state and known as dhimmi
Dhimmi
A , is a non-Muslim subject of a state governed in accordance with sharia law. Linguistically, the word means "one whose responsibility has been taken". This has to be understood in the context of the definition of state in Islam...

(meaning protected), and were to pay a special tax, the jizya
Jizya
Under Islamic law, jizya or jizyah is a per capita tax levied on a section of an Islamic state's non-Muslim citizens, who meet certain criteria...

 (tribute), which was calculated per individual at varying rates, usually two dirham
Dirham
Dirham or dirhem is a unit of currency in several Arab or Berber nations, and formerly the related unit of mass in the Ottoman Empire and Persian states...

s for able bodied men of military age, in return for their exemption from military services. Women and Children were exempted from the Jizya.
Mass conversions were neither desired nor allowed, at least in the first few centuries of Arab rule Caliph Umar had liberal policies towards dhimmis. These policies were adopted to make the conquered less prone to rise up against their new masters and thus making them more receptive to Arab colonization, as it for the time being gave them release from the intolerable social inferiority system of the old Sassanid regime.
Umar is reported to have issued the following instructions about the protected people:

Umar's liberal policies were continued by at least his immediate successors. In his dying charge to his successor he is reported to have said:

Practically the Jizya replaced poll taxes imposed by the Sassanids, which tended to be much higher than the Jizya. In addition to the Jizya the old Sassanid land tax (Known in Arabic as Kharaj) was also adopted. Caliph Umar is said to have occasionally setup a commission to survey the taxes in order to check that they wouldn't be more than the land could bear. It is narrated that Zoroastrians were subjected to humiliation and ridicule when paying the Jizya
Jizya
Under Islamic law, jizya or jizyah is a per capita tax levied on a section of an Islamic state's non-Muslim citizens, who meet certain criteria...

 in order to make them feel inferior,.

For at least under Rashiduns and early Ummayads, the administrative system of the late Sassanid period was largely retained.
This was a pyramidal system where each quarter of the state was divided into provinces, the provinces into districts, and the districts into sub-districts.
Provinces were called ustan (Middle Persian ostan), the districts shahrs, centered upon a district capital known as shahristan. The subdistricts were called tasok in Middle Persian, which was adopted as tassuj (plural tasasij) into Arabic.

Religion

Having effectively been recognized as dhimmis under the Rashidun Caliphs, on the terms of annual payment of the Jizya, Zoroastrians were sometimes left largely to themselves, but this practice varied from area to area. Due to their financial interests, the Ummayads generally discouraged the conversion of non-Arabs, as the dhimmis provided them with valuable revenues (Jizya).

Before the conquest, the Persians had been mainly Zoroastrian. The historian Al-Masudi
Al-Masudi
Abu al-Hasan Ali ibn al-Husayn ibn Ali al-Mas'udi , was an Arab historian and geographer, known as the "Herodotus of the Arabs." Al-Masudi was one of the first to combine history and scientific geography in a large-scale work, Muruj adh-dhahab...

, a Baghdad-born Arab, who wrote a comprehensive treatise on history and geography in about 956, records that after the conquest:
He also added Sindh
Sindh
Sindh historically referred to as Ba'ab-ul-Islam , is one of the four provinces of Pakistan and historically is home to the Sindhi people. It is also locally known as the "Mehran". Though Muslims form the largest religious group in Sindh, a good number of Christians, Zoroastrians and Hindus can...

 and Sin of the Indian subcontinent
Indian subcontinent
The Indian subcontinent, also Indian Subcontinent, Indo-Pak Subcontinent or South Asian Subcontinent is a region of the Asian continent on the Indian tectonic plate from the Hindu Kush or Hindu Koh, Himalayas and including the Kuen Lun and Karakoram ranges, forming a land mass which extends...

 (Al-Hind) to the list. This general statement of al Masudi is fully supported by the medieval geographers who make mention of fire temples in most of the Iranian towns.

Muslim
Muslim
A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

 leaders in their effort to win converts encouraged attendance at Muslim prayer with promises of money and allowed the Quran to be recited in Persian
Persian language
Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

 instead of Arabic so that it would be intelligible to all. Islam was readily accepted by Zoroastrians who were employed in industrial and artisan positions because, according to Zoroastrian dogma, such occupations that involved defiling fire made them impure . Moreover, Muslim missionaries did not encounter difficulty in explaining Islamic tenants to Zoroastrian, as there were many similarities between the faiths. According to Thomas Walker Arnold
Thomas Walker Arnold
Sir Thomas Walker Arnold was an eminent British orientalist and historian of Islamic art who taught at MAO College, Aligarh Muslim University, then Aligarh College, and Government College University, Lahore. He was a friend of Sir Syed Ahmed Khan, and wrote his famous book "The preaching of Islam"...

, for the Persian, he would meet Ahura Mazda
Ahura Mazda
Ahura Mazdā is the Avestan name for a divinity of the Old Iranian religion who was proclaimed the uncreated God by Zoroaster, the founder of Zoroastrianism...

 and Ahriman under the names of Allah
Allah
Allah is a word for God used in the context of Islam. In Arabic, the word means simply "God". It is used primarily by Muslims and Bahá'ís, and often, albeit not exclusively, used by Arabic-speaking Eastern Catholic Christians, Maltese Roman Catholics, Eastern Orthodox Christians, Mizrahi Jews and...

 and Iblis. In Afghanistan
Afghanistan
Afghanistan , officially the Islamic Republic of Afghanistan, is a landlocked country located in the centre of Asia, forming South Asia, Central Asia and the Middle East. With a population of about 29 million, it has an area of , making it the 42nd most populous and 41st largest nation in the world...

, Islam was spread due to Umayyad
Umayyad
The Umayyad Caliphate was the second of the four major Arab caliphates established after the death of Muhammad. It was ruled by the Umayyad dynasty, whose name derives from Umayya ibn Abd Shams, the great-grandfather of the first Umayyad caliph. Although the Umayyad family originally came from the...

 missionary efforts particularly under the reign of Hisham ibn Abd al-Malik
Hisham ibn Abd al-Malik
Hisham ibn Abd al-Malik 10th Umayyad caliph who ruled from 723 until his death in 743. When he was born in 691 his mother named him after her father....

 and Umar ibn AbdulAziz.

There were also large and thriving Christian
Christian
A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

 and Jewish communities, along with smaller numbers of Buddhists and other groups. However, there was a slow but steady movement of the population towards Islam
Islam
Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

. The nobility and city-dwellers were the first to convert. Islam spread more slowly among the peasantry and the dihqans, or landed gentry. By the late 10th century, the majority of the Persians had become Muslim.
Until the 15th century, most Persian Muslims were Sunni Muslims
Sunni Islam
Sunni Islam is the largest branch of Islam. Sunni Muslims are referred to in Arabic as ʾAhl ūs-Sunnah wa āl-Ǧamāʿah or ʾAhl ūs-Sunnah for short; in English, they are known as Sunni Muslims, Sunnis or Sunnites....

, though today Iran is known as a stronghold of the Shi'a Muslim faith. Recognizing Islam as their religion and the prophet's son in law, Ali
Ali
' |Ramaḍān]], 40 AH; approximately October 23, 598 or 600 or March 17, 599 – January 27, 661).His father's name was Abu Talib. Ali was also the cousin and son-in-law of the Islamic prophet Muhammad, and ruled over the Islamic Caliphate from 656 to 661, and was the first male convert to Islam...

 as an enduring symbol of justice.

Ancient Zorastrian Fire Temples

Place Description Other Information
Isthakar Recorded in the Bam nama -a history of Kirman

Language

During the Rashidun Caliphate
Rashidun Caliphate
The Rashidun Caliphate , comprising the first four caliphs in Islam's history, was founded after Muhammad's death in 632, Year 10 A.H.. At its height, the Caliphate extended from the Arabian Peninsula, to the Levant, Caucasus and North Africa in the west, to the Iranian highlands and Central Asia...

, the official language of Persia remained Persian, just as the official languages of Syria
Syria
Syria , officially the Syrian Arab Republic , is a country in Western Asia, bordering Lebanon and the Mediterranean Sea to the West, Turkey to the north, Iraq to the east, Jordan to the south, and Israel to the southwest....

 and Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

 remained Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 and Coptic
Coptic language
Coptic or Coptic Egyptian is the current stage of the Egyptian language, a northern Afro-Asiatic language spoken in Egypt until at least the 17th century. Egyptian began to be written using the Greek alphabet in the 1st century...

. However, during the Ummayad Caliphate, the Ummayads imposed Arabic as the primary language of their subjected people throughout their empire, displacing their indigenous languages. Although an area from Iraq to Morocco
Morocco
Morocco , officially the Kingdom of Morocco , is a country located in North Africa. It has a population of more than 32 million and an area of 710,850 km², and also primarily administers the disputed region of the Western Sahara...

 speaks Arabic to this day, Middle Persian
Middle Persian
Middle Persian , indigenously known as "Pârsig" sometimes referred to as Pahlavi or Pehlevi, is the Middle Iranian language/ethnolect of Southwestern Iran that during Sassanid times became a prestige dialect and so came to be spoken in other regions as well. Middle Persian is classified as a...

 proved to be much more enduring. Most of its structure and vocabulary survived, evolving into the modern Persian language
Persian language
Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

. However, Persian did incorporate a certain amount of Arabic vocabulary, especially words pertaining to religion, and it switched from the Pahlavi
Pahlavi scripts
Pahlavi or Pahlevi denotes a particular and exclusively written form of various Middle Iranian languages. The essential characteristics of Pahlavi are*the use of a specific Aramaic-derived script, the Pahlavi script;...

 Aramaic alphabet
Aramaic alphabet
The Aramaic alphabet is adapted from the Phoenician alphabet and became distinctive from it by the 8th century BC. The letters all represent consonants, some of which are matres lectionis, which also indicate long vowels....

 to a modified version of the Arabic alphabet
Arabic alphabet
The Arabic alphabet or Arabic abjad is the Arabic script as it is codified for writing the Arabic language. It is written from right to left, in a cursive style, and includes 28 letters. Because letters usually stand for consonants, it is classified as an abjad.-Consonants:The Arabic alphabet has...

.

See also

  • Islamization in Iran
  • History of Arabs in Afghanistan
    History of Arabs in Afghanistan
    The history of Arabs in Afghanistan spans over one millennium, from the 7th century Islamic conquest when Arab ghazis arrived with their Islamic mission until recently when others from the Arab world arrived to defend fellow Muslims from the Soviet followed by their liberation by NATO forces...

  • History of Iran
    History of Iran
    The history of Iran has been intertwined with the history of a larger historical region, comprising the area from the Danube River in the west to the Indus River and Jaxartes in the east and from the Caucasus, Caspian Sea, and Aral Sea in the north to the Persian Gulf and the Gulf of Oman and Egypt...

  • Military history of Iran
    Military history of Iran
    With thousands of years of recorded history, and due to an unchanging geographic condition, Iran has had a long, varied, and checkered military culture and history, ranging from triumphant and unchallenged ancient military supremacy affording effective superpower status in its day, to a series of...

  • Fall of Sassanid dynasty
  • Muslim conquests
    Muslim conquests
    Muslim conquests also referred to as the Islamic conquests or Arab conquests, began with the Islamic prophet Muhammad. He established a new unified polity in the Arabian Peninsula which under the subsequent Rashidun and Umayyad Caliphates saw a century of rapid expansion of Muslim power.They...

    • Islamic conquest of Afghanistan
      Islamic conquest of Afghanistan
      The Islamic conquest of Afghanistan began in the middle of the 7th century after the Islamic conquest of Persia was completed, when Arab Muslims defeated the Sassanid Empire at the battles of Walaja, al-Qādisiyyah and Nahavand. The Muslim Arabs then began to move towards the lands east of Persia...

    • Islamic conquest of Turkestan
      Islamic conquest of Turkestan
      The Islamic conquest of Turkestan or the Arab conquest of Turkestan was the conquest of Turkestan by the Arab-Islamic armies as part of Muslim conquests...

  • Spread of Islam
    Spread of Islam
    The Spread of Islam started shortly after the death of the Islamic prophet Muhammad in 632 AD. During his lifetime, the community of Muhammad, the ummah, was established in the Arabian Peninsula by means of conversion to Islam and conquering of territory, and oftentimes the conquered had to either...


External links

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