373

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Year 373 (CCCLXXIII) was a common year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Valens (or, less frequently, year 1126 Ab urbe condita). The denomination 373 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Events

Emperor Valens is converted to Arianism, and orders the persecution of Trinitarian Christians in the Roman East.
Quintus Aurelius Symmachus becomes proconsul of Africa, and is made a member of the pontifical college.
Count Theodosius is appointed commander of an expedition to suppress the rebellion of Firmus in Mauretania.
The Aqueduct of Valens is inaugurated near Constantinople (modern Istanbul); the aqueduct has a length of 971 meters.

Battle of the Tanais River: The Huns defeat the Alans near the Don, sending the remnants fleeing westward.

King Shapur II declares war as a result of Valens' support of Armenia. Emperor Valens makes Antioch his military base for the campaign against Persia.

May 2 – Athanasius of Alexandria, Egyptian bishop and saint (b. 296){{Cite book |last=Errington |first=Robert Malcolm |author-link=Robert Malcolm Errington |title= Roman Imperial Policy from Julian to Theodosius |publisher=University of North Carolina Press |isbn=9780807877456 |location=Chapel Hill, North Carolina |publication-date=October 15, 2007 |pages=180}}
June 9 – Ephrem the Syrian, Syrian Orthodox priest and saint (b. 306)
Huan Wen (or Yuanzi), Chinese general and regent (b. 312)
Nerses I (the Great), Armenian catholicos (or patriarch)
Sun Sheng, Chinese historian and politician (b. 302)

File:Mor Ephrem icon.jpg|Saint Ephrem the Syrian

File:Ikone Athanasius von Alexandria.jpg|Saint Athanasius of Alexandria

File:Nerses.jpg|Saint Nerses I