321
Encyclopedia
Year 321 was a common year starting on Sunday
Common year starting on Sunday
This is the calendar for any common year starting on Sunday, January 1 or for any year in which “Doomsday” is Tuesday. Examples: Gregorian years 1989, 1995, 2006, 2017 and 2023or Julian year 1917...

 (link will display the full calendar) of the Julian calendar
Julian calendar
The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...

. At the time, it was known as the Year of the Consulship of Crispus and Constantinus (or, less frequently, year 1074 Ab urbe condita
Ab urbe condita
Ab urbe condita is Latin for "from the founding of the City ", traditionally set in 753 BC. AUC is a year-numbering system used by some ancient Roman historians to identify particular Roman years...

). The denomination 321 for this year has been used since the early medieval period, when the Anno Domini
Anno Domini
and Before Christ are designations used to label or number years used with the Julian and Gregorian calendars....

 calendar era
Calendar era
A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era . The instant, date, or year from which time is marked is called the epoch of the era...

 became the prevalent method in Europe for naming years.

Roman Empire

  • March 7 – Edict of Constantine I: The dies Solis Invicti
    Sol Invictus
    Sol Invictus was the official sun god of the later Roman empire. In 274 Aurelian made it an official cult alongside the traditional Roman cults. Scholars disagree whether the new deity was a refoundation of the ancient Latin cult of Sol, a revival of the cult of Elagabalus or completely new...

     (Sunday
    Sunday
    Sunday is the day of the week between Saturday and Monday. For most Christians, Sunday is observed as a day for worship of God and rest, due to the belief that it is Lord's Day, the day of Christ's resurrection....

    ) is proclaimed as the day of rest, trade
    Trade
    Trade is the transfer of ownership of goods and services from one person or entity to another. Trade is sometimes loosely called commerce or financial transaction or barter. A network that allows trade is called a market. The original form of trade was barter, the direct exchange of goods and...

     is forbidden and agriculture
    Agriculture
    Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the...

     is allowed. Jews
    Jews
    The Jews , also known as the Jewish people, are a nation and ethnoreligious group originating in the Israelites or Hebrews of the Ancient Near East. The Jewish ethnicity, nationality, and religion are strongly interrelated, as Judaism is the traditional faith of the Jewish nation...

     continue to observe the Sabbath
    Sabbath
    Sabbath in Christianity is a weekly day of rest or religious observance, derived from the Biblical Sabbath.Seventh-day Sabbath observance, i.e. resting from labor from Friday sunset to Saturday sunset, is practiced by seventh-day Sabbatarians...

     on Saturday
    Saturday
    Saturday is the day of the week following Friday and preceding Sunday.Saturday is the last day of the week on many calendars and in conventions that consider the week as beginning on Sunday, or the sixth day of the week according to international standard ISO 8601 which was first published in...

    , and Constantine himself continues to worship the ancient Roman sun god, Apollo
    Apollo
    Apollo is one of the most important and complex of the Olympian deities in Greek and Roman mythology...

    , despite his acceptance 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...

    .
  • Emperor Constantine I expels the Goths
    Goths
    The Goths were an East Germanic tribe of Scandinavian origin whose two branches, the Visigoths and the Ostrogoths, played an important role in the fall of the Roman Empire and the emergence of Medieval Europe....

     from the Danube
    Danube
    The Danube is a river in the Central Europe and the Europe's second longest river after the Volga. It is classified as an international waterway....

     frontier and repairs Trajan's Bridge
    Trajan's bridge
    Trajan's Bridge or Bridge of Apollodorus over the Danube was a Roman segmental arch bridge, the first to be built over the lower Danube. For more than a thousand years, it was the longest arch bridge in the world, in terms of both total and span length...

    . He leads a expedition into the old province Dacia
    Dacia
    In ancient geography, especially in Roman sources, Dacia was the land inhabited by the Dacians or Getae as they were known by the Greeks—the branch of the Thracians north of the Haemus range...

     (modern Romania
    Romania
    Romania is a country located at the crossroads of Central and Southeastern Europe, on the Lower Danube, within and outside the Carpathian arch, bordering on the Black Sea...

    ) and makes peace with the barbarians.

Asia

  • Tuoba Heru
    Tuoba Heru
    Tuoba Heru ruled as prince of the Tuoba Dai 321 to 325. He was the son of Tuoba Yituo, and the brother of Tuoba Pugen and Tuoba Gena. In 321, when his cousin Tuoba Yulü was the Prince of Dai, Tuoba Heru launched a coup d'état against his cousin, killing Tuoba Yulü and becoming the Prince of Dai...

     launched a coup d'état
    Coup d'état
    A coup d'état state, literally: strike/blow of state)—also known as a coup, putsch, and overthrow—is the sudden, extrajudicial deposition of a government, usually by a small group of the existing state establishment—typically the military—to replace the deposed government with another body; either...

     against his cousin Tuoba Yulü
    Tuoba Yulü
    Tuoba Yulü ruled as prince of the Tuoba Dai 316 to 321.He was the son of Tuoba Fu, and the father of Tuoba Yihuai and Tuoba Shiyijian. In 310, Tuoba Yulü was ordered by Tuoba Yilu to assist Liu Kun , the Governor of Bingzhou , to fight the Xiongnu Tiefu chieftain Liu Hu...

     and becomes the new Prince of Dai
    State of Dai
    Dai was a state of the Xianbei clan of Tuoba, during the era of Sixteen Kingdoms in China. It existed from 310 to 376 AD, with its capital at Shengle ....

    .

Food and drink

  • Constantine I assigns convict
    Convict
    A convict is "a person found guilty of a crime and sentenced by a court" or "a person serving a sentence in prison", sometimes referred to in slang as simply a "con". Convicts are often called prisoners or inmates. Persons convicted and sentenced to non-custodial sentences often are not termed...

    s to grind Rome's flour
    Flour
    Flour is a powder which is made by grinding cereal grains, other seeds or roots . It is the main ingredient of bread, which is a staple food for many cultures, making the availability of adequate supplies of flour a major economic and political issue at various times throughout history...

     in a move to hold back the rising price of food
    Food
    Food is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals...

     in an empire whose population has shrunk as a result of plague
    Plague
    -Medicine:* Plague , a specific disease caused by Yersinia pestis. There are three major manifestations:** Bubonic plague** Septicemic plague** Pneumonic plague* An epidemic of infectious disease* A pandemic caused by such a disease...

     (see 309
    309
    Year 309 was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Licinianus and Constantius...

     AD).

Religion

  • The Roman Catholic church
    Roman Catholic Church
    The Catholic Church, also known as the Roman Catholic Church, is the world's largest Christian church, with over a billion members. Led by the Pope, it defines its mission as spreading the gospel of Jesus Christ, administering the sacraments and exercising charity...

     is allowed to hold property.
  • A synod
    Synod
    A synod historically is a council of a church, usually convened to decide an issue of doctrine, administration or application. In modern usage, the word often refers to the governing body of a particular church, whether its members are meeting or not...

     in Alexandria
    Alexandria
    Alexandria is the second-largest city of Egypt, with a population of 4.1 million, extending about along the coast of the Mediterranean Sea in the north central part of the country; it is also the largest city lying directly on the Mediterranean coast. It is Egypt's largest seaport, serving...

     condemns Arianism
    Arianism
    Arianism is the theological teaching attributed to Arius , a Christian presbyter from Alexandria, Egypt, concerning the relationship of the entities of the Trinity and the precise nature of the Son of God as being a subordinate entity to God the Father...

    .


Births

  • Du Lingyang
    Empress Du Lingyang
    Empress Du Lingyang , formally Empress Chengong was an empress of Jin Dynasty . Her husband was Emperor Cheng of Jin. Empress Du Lingyang (杜陵陽) (321–341), formally Empress Chengong (成恭皇后, literally "the successful and respectful empress") was an empress of Jin Dynasty (265-420). Her husband...

    , empress of the Jin Dynasty
    Jìn Dynasty (265-420)
    The Jìn Dynasty , was a dynasty in Chinese history, lasting between the years 265 and 420 AD. There are two main divisions in the history of the Dynasty, the first being Western Jin and the second Eastern Jin...

     (d. 341
    341
    Year 341 was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcellinus and Probinus...

    )
  • Jin Chengdi
    Emperor Cheng of Jin
    Emperor Cheng of Jin , personal name Sima Yan , courtesy name Shigen , was an emperor of the Eastern Jin Dynasty . He was the eldest son of Emperor Ming and became the crown prince on April 1, 325...

    , emperor of the Jin Dynasty (d. 342
    342
    Year 342 was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Constantius and Claudius...

    )
  • Valentinian I
    Valentinian I
    Valentinian I , also known as Valentinian the Great, was Roman emperor from 364 to 375. Upon becoming emperor he made his brother Valens his co-emperor, giving him rule of the eastern provinces while Valentinian retained the west....

    , Roman Emperor
    Roman Emperor
    The Roman emperor was the ruler of the Roman State during the imperial period . The Romans had no single term for the office although at any given time, a given title was associated with the emperor...

     (d. 375
    375
    Year 375 was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year after the Consulship of Augustus and Equitius...

    )
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