__NOTOC__ Year 337 ( CCCXXXVII) was a

common year starting on Saturday A common year starting on Saturday is any non-leap year (i.e. a year with 365 days) that begins on Saturday, 1 January, and ends on Saturday, 31 December. Its dominical letter hence is B. The most recent year of such kind was 2022, and the next ...

of the

Julian calendar The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts ...

. At the time, it was known as the Year of the Consulship of Felicianus and Titianus (or, less frequently, year 1090 ''

Ab urbe condita ''Ab urbe condita'' (; 'from the founding of Rome, founding of the City'), or (; 'in the year since the city's founding'), abbreviated as AUC or AVC, expresses a date in years since 753 BC, 753 BC, the traditional founding of Rome. It is ...

''). The denomination 337 for this year has been used since the early medieval period, when the

Anno Domini The terms (AD) and before Christ (BC) are used when designating years in the Gregorian calendar, Gregorian and Julian calendar, Julian calendars. The term is Medieval Latin and means "in the year of the Lord" but is often presented using "o ...

calendar era A calendar era is the period of time elapsed since one '' epoch'' of a calendar and, if it exists, before the next one. For example, the current year is numbered in the Gregorian calendar, which numbers its years in the Western Christian era ...

became the prevalent method in Europe for naming years.

Events

By place

Roman Empire

May 22 Events Pre-1600 * 192 – Dong Zhuo is assassinated by his adopted son Lü Bu. * 760 – Fourteenth recorded perihelion passage of Halley's Comet. * 853 – A Byzantine fleet sacks and destroys undefended Damietta in Egypt. ...

–

Constantine the Great Constantine I (27 February 27222 May 337), also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a Constantine the Great and Christianity, pivotal ro ...

, first Christian Roman emperor of the Western Empire (312–324), and of the

Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...

(324–337), dies in Achyron, near

Nicomedia Nicomedia (; , ''Nikomedeia''; modern İzmit) was an ancient Greece, ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocletian who rul ...

, at age 65, after he is

baptized Baptism (from ) is a Christian sacrament of initiation almost invariably with the use of water. It may be performed by sprinkling or pouring water on the head, or by immersing in water either partially or completely, traditionally three ...

Eusebius of Nicomedia Eusebius of Nicomedia (; ; died 341) was an Arian priest who baptised Constantine the Great on his deathbed in 337. A fifth-century legend evolved that Pope Sylvester I was the one to baptise Constantine, but this is dismissed by scholars as ...

. *

September September is the ninth month of the year in the Julian and Gregorian calendars. Its length is 30 days. September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent. In the Northern hemisphere, the b ...

– A number of descendants of

Constantius Chlorus Flavius Valerius Constantius ( – 25 July 306), also called Constantius I, was a Roman emperor from 305 to 306. He was one of the four original members of the Tetrarchy established by Diocletian, first serving as Caesar (title), ''caesar'' ...

, and officials of the Roman Empire, are executed for a

purge In history, religion and political science, a purge is a position removal or execution of people who are considered undesirable by those in power from a government, another, their team leaders, or society as a whole. A group undertaking such an ...

against the sons of

Constantine I Constantine I (27 February 27222 May 337), also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a Constantine the Great and Christianity, pivotal ro ...

. *

September 9 Events Pre-1600 *337 – Constantine II, Constantius II, and Constans succeed their father Constantine I as co-emperors. The Roman Empire is divided between the three Augusti. * 1000 – Battle of Svolder, Viking Age. * 1141 &ndas ...

– Constantine II,

Constantius II Constantius II (; ; 7 August 317 – 3 November 361) was Roman emperor from 337 to 361. His reign saw constant warfare on the borders against the Sasanian Empire and Germanic peoples, while internally the Roman Empire went through repeated civ ...

, and

Constans Flavius Julius Constans ( 323 – 350), also called Constans I, was Roman emperor from 337 to 350. He held the imperial rank of '' caesar'' from 333, and was the youngest son of Constantine the Great. After his father's death, he was made ''a ...

succeed their father Constantine I as co-emperors. The Roman Empire is divided between the three Augusti (see map).

Persia

* King

Shapur II Shapur II ( , 309–379), also known as Shapur the Great, was the tenth King of Kings (List of monarchs of the Sasanian Empire, Shahanshah) of Sasanian Iran. He took the title at birth and held it until his death at age 70, making him the List ...

Persia Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...

begins a war against the Roman Empire. He sends his troops across the

Tigris The Tigris ( ; see #Etymology, below) is the eastern of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of the Armenian Highlands through the Syrian Desert, Syrian and Arabia ...

to recover

Armenia Armenia, officially the Republic of Armenia, is a landlocked country in the Armenian Highlands of West Asia. It is a part of the Caucasus region and is bordered by Turkey to the west, Georgia (country), Georgia to the north and Azerbaijan to ...

and

Mesopotamia Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...

. * Shapur II besieges the Roman fortress of

Nisibis Nusaybin () is a municipality and Districts of Turkey, district of Mardin Province, Turkey. Its area is 1,079 km2, and its population is 115,586 (2022). The city is populated by Kurds of different tribal affiliation. Nusaybin is separated ...

(

Syria Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to Syria–Turkey border, the north, Iraq to Iraq–Syria border, t ...

), but is repulsed by forces under Lucilianus.

China

Murong Huang Murong Huang (; 297 – 25 October 348), courtesy name Yuanzhen (元真), also known by his posthumous name as the Emperor Wenming of Former Yan (前燕文明帝), was the founding monarch of the Xianbei-led Former Yan dynasty of China. When h ...

claims the title of Prince of Yan, effectively beginning the kingdom of

Former Yan Yan, known in historiography as the Former Yan (; 337–370), was a dynastic state of China ruled by the Murong clan of the Xianbei during the Sixteen Kingdoms period. From Liaoning, the Former Yan later conquered and ruled over Hebei, Shaanxi, ...

By topic

Religion

February 6 Events Pre-1600 * 590 – Hormizd IV, king of the Sasanian Empire, is overthrown and blinded by his brothers-in-law Vistahm and Vinduyih. * 1579 – The Diocese of Manila is erected by papal bull, with Domingo de Salazar appointe ...

– A 4-month papal vacancy ends; Pope Julius I succeeds Pope Mark, as the 35th pope. *

June 17 Events Pre-1600 * 653 – Pope Martin I is arrested and taken to Constantinople, due to his opposition to monothelitism. *1242 – Following the Disputation of Paris, twenty-four carriage loads of Jewish religious manuscripts were burn ...

– Constantius II announces the restoration of

Athanasius Athanasius I of Alexandria ( – 2 May 373), also called Athanasius the Great, Athanasius the Confessor, or, among Coptic Christians, Athanasius the Apostolic, was a Christian theologian and the 20th patriarch of Alexandria (as Athanasius ...

, as

Patriarch of Alexandria The Patriarch of Alexandria is the archbishop of Alexandria, Egypt. Historically, this office has included the designation "pope" (etymologically "Father", like "Abbot"). The Alexandrian episcopate was revered as one of the three major epi ...

. * Paul I becomes

Patriarch of Constantinople The ecumenical patriarch of Constantinople () is the archbishop of Constantinople and (first among equals) among the heads of the several autocephalous churches that comprise the Eastern Orthodox Church. The ecumenical patriarch is regarded as ...

. * Christianity is declared an official religion in Caucasian Iberia, marking the rise of Christianity in Georgia.

Births

Faxian Faxian (337–), formerly romanization of Chinese, romanized as Fa-hien and Fa-hsien, was a Han Chinese, Chinese Chinese Buddhism, Buddhist bhikkhu, monk and translator who traveled on foot from Eastern Jin dynasty, Jin China to medieval India t ...

, Chinese Buddhist

monk A monk (; from , ''monachos'', "single, solitary" via Latin ) is a man who is a member of a religious order and lives in a monastery. A monk usually lives his life in prayer and contemplation. The concept is ancient and can be seen in many reli ...

, traveler (approximate date) * Fú Jiān, emperor of the Chinese Di state

Former Qin Qin, known as the Former Qin and Fu Qin (苻秦) in historiography, was a Dynasties of China, dynastic state of China ruled by the Fu (Pu) clan of the Di (Five Barbarians), Di peoples during the Sixteen Kingdoms period. Founded in the wake of ...

(d. 385) * Lü Guang, founding emperor of the Di state Later Liang (d.

400 __NOTOC__ Year 400 (Roman numerals, CD) was a leap year starting on Sunday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Stilicho and Aurelianus (consul 400), Aurelianus (or, less frequently, year ...

) *

Zenobius of Florence Saint Zenobius () (337–417) who was the first bishop of Florence. Venerated in the Catholic Church, his feast day is celebrated on May 25. Life Born of a Florentine noble family, Zenobius was educated by his pagan parents. He came under the ...

, Italian bishop and wonderworker (d. 417)

Deaths

Statua di Costantino ai musei capitolini

January 13 Events Pre-1600 * 27 BC – Octavian transfers the state to the free disposal of the Roman Senate and the people. He receives Spain, Gaul, and Syria as his province for ten years. * 532 – The Nika riots break out, during the ra ...

–

Leontius of Caesarea Leontius of Caesarea (died 337) was a bishop of Caesarea Mazaca, in Cappadocia. He was childhood friends with Gregory the Illuminator, later in life Leontius would consecrate Gregory to become the patriarch of the Armenians. Leontius attended th ...

Roman Catholic The Catholic Church (), also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institut ...

bishop and saint *

February 21 Events Pre-1600 * 452 or 453 – Severianus, Bishop of Scythopolis, is martyred in Palestine. * 1245 – Thomas, the first known Bishop of Finland, is granted resignation after confessing to torture and forgery. * 1440 – The ...

– Eustathius the Great, patriarch of

Antioch Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...

(approximate date) *

–

, emperor of the

, Orthodox priest and saint *

May 27 Events Pre-1600 * 1096 – Count Emicho enters Mainz, where his followers massacre Jewish citizens. At least 600 Jews are killed. * 1120 – Richard III of Capua is anointed as Prince two weeks before his untimely death. * 1153 &nda ...

– Flavius Dalmatius, father of Dalmatius and Hannibalianus (executed) * August 30 – Alexander of Constantinople, bishop of

Byzantium Byzantium () or Byzantion () was an ancient Greek city in classical antiquity that became known as Constantinople in late antiquity and Istanbul today. The Greek name ''Byzantion'' and its Latinization ''Byzantium'' continued to be used as a n ...

(approximate date) * September 11 –

Julius Constantius Flavius Julius Constantius (died September 337 AD) was a member of the Constantinian dynasty, being a son of Emperor Constantius Chlorus and his wife Flavia Maximiana Theodora, a younger half-brother of Emperor Constantine the Great and the fath ...

, son of

(executed) *

September 24 Events Pre-1600 *AD 787, 787 – Second Council of Nicaea: The council assembles at the church of Hagia Sophia. *1568 – Spanish naval forces defeat an English fleet, under the command of John Hawkins, at the Battle of San Juan de Ul� ...

– Hannibalianus, king of the Pontus and nephew of Constantine I (executed) *

September 27 Events Pre-1600 * 1066 – William the Conqueror and his army set sail from the mouth of the Somme river, beginning the Norman conquest of England. * 1331 – The Battle of Płowce is fought, between the Kingdom of Poland and the Teut ...

– Dalmatius,

Caesar Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war. He ...

and nephew of Constantine I (executed)

References

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