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Year 451 was a common year starting on Monday
Common year starting on Monday
This is the calendar for any common year starting on Monday, January 1 . Examples: Gregorian year 1990, 2001, 2007 and 2018or Julian year 1918 ....

 (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 Marcianus and Adelfius (or, less frequently, year 1204 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 451 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.

Western Roman Empire

  • April 7 – The Huns
    The Huns were a group of nomadic people who, appearing from east of the Volga River, migrated into Europe c. AD 370 and established the vast Hunnic Empire there. Since de Guignes linked them with the Xiongnu, who had been northern neighbours of China 300 years prior to the emergence of the Huns,...

     sack Metz
    Metz is a city in the northeast of France located at the confluence of the Moselle and the Seille rivers.Metz is the capital of the Lorraine region and prefecture of the Moselle department. Located near the tripoint along the junction of France, Germany, and Luxembourg, Metz forms a central place...

  • June 20 – Battle of Chalons
    Battle of Chalons
    The Battle of the Catalaunian Plains , also called the Battle of Châlons sur Marne, took place in AD 451 between a coalition led by the Visigothic king Theodoric I and the Roman general Flavius Aëtius, against the Huns and their allies commanded by their leader Attila...

    : The Huns
    The Huns were a group of nomadic people who, appearing from east of the Volga River, migrated into Europe c. AD 370 and established the vast Hunnic Empire there. Since de Guignes linked them with the Xiongnu, who had been northern neighbours of China 300 years prior to the emergence of the Huns,...

     and the Ostrogoths, facing the Romans
    Ancient Rome
    Ancient Rome was a thriving civilization that grew on the Italian Peninsula as early as the 8th century BC. Located along the Mediterranean Sea and centered on the city of Rome, it expanded to one of the largest empires in the ancient world....

     and the Visigoths, achieve at best a draw. After the battle, between 10,000 and 20,000 men lie dead on the Catalaunian Fields.


  • Battle of Vartanantz
    Battle of Vartanantz
    The Battle of Avarayr also known as Battle of Vartanantz, was fought on May 26, 451 on the Avarayr Plain in Vaspurakan, between the Armenian Army under Saint Vartan and their Sassanid rulers...

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

    n army is defeated by the Persians, and their rebel leader, Saint Vartan, dies. Despite the loss, Armenians
    Armenian people or Armenians are a nation and ethnic group native to the Armenian Highland.The largest concentration is in Armenia having a nearly-homogeneous population with 97.9% or 3,145,354 being ethnic Armenian....

     consider this battle to have been a moral and religious victory, since the Persian king, out of respect for their efforts, allows them to remain Christian. The anniversary is a national and religious holiday.


  • Sassanid ruler Yazdegerd II's decree abolishes the Sabbath
    Shabbat is the seventh day of the Jewish week and a day of rest in Judaism. Shabbat is observed from a few minutes before sunset on Friday evening until a few minutes after when one would expect to be able to see three stars in the sky on Saturday night. The exact times, therefore, differ from...

    , and orders executions of Jewish leaders, including the Exilarch
    Exilarch refers to the leaders of the Diaspora Jewish community in Babylon following the deportation of King Jeconiah and his court into Babylonian exile after the first fall of Jerusalem in 597 BCE and augmented after the further deportations following the destruction...

     Mar Nuna.


  • October 8 – Council of Chalcedon
    Council of Chalcedon
    The Council of Chalcedon was a church council held from 8 October to 1 November, 451 AD, at Chalcedon , on the Asian side of the Bosporus. The council marked a significant turning point in the Christological debates that led to the separation of the church of the Eastern Roman Empire in the 5th...

    , Ecumenical council
    Ecumenical council
    An ecumenical council is a conference of ecclesiastical dignitaries and theological experts convened to discuss and settle matters of Church doctrine and practice....

     of the Christian church. As a result of this council the Oriental Orthodox churches became a separate communion.
  • Jerusalem becomes a Patriarchate.
  • Dioscorus of Alexandria
    Dioscorus of Alexandria
    Pope Dioscorus I of Alexandria was Patriarch of Alexandria from 444. He was deposed by the Council of Chalcedon in 451 but was recognized as Patriarch by the Coptic Church until his death. He died in Asia Minor, on September 17, 454...

     is deposed as Patriarch of Antioch
    Patriarch of Antioch
    Patriarch of Antioch is a traditional title held by the Bishop of Antioch. As the traditional "overseer" of the first gentile Christian community, the position has been of prime importance in the church from its earliest period...



  • Theodoric I
    Theodoric I
    Theodoric I sometimes called Theodorid and in Spanish, Portuguese and Italian Teodorico, was the King of the Visigoths from 418 to 451. An illegitimate son of Alaric, Theodoric is famous for defeating Attila at the Battle of the Catalaunian Plains in 451, where he was mortally wounded.-Early...

    , king of the Visigoths (killed in battle)
  • Liu Yikang
    Liu Yikang
    Liu Yikang , nickname Chezi , was an imperial prince of the Chinese dynasty Liu Song. He was a son of Emperor Wu , and served as prime minister during the reign of his brother Emperor Wen...

  • Tuoba Huang
    Tuoba Huang
    Tuoba Huang , formally Crown Prince Jingmu , later further formally honored as Emperor Jingmu with the temple name Gongzong by his son Emperor Wencheng, was a crown prince of the Chinese/Xianbei dynasty Northern Wei...