Saint Martin of Tours undertakes the Christianization of Gaul. Battle of the Tanais River: The Huns defeat the Alans near the Don, sending the remnants fleeing westward. The Aqueduct of Valens is inaugurated near Constantinople (modern Istanbul); the aqueduct has a length of 971 meters.
Geopolitics & Diplomacy
The Aqueduct of Valens is inaugurated near Constantinople (modern Istanbul); the aqueduct has a length of 971 meters.source
Conflict & Security
Battle of the Tanais River: The Huns defeat the Alans near the Don, sending the remnants fleeing westward.source
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.source
Exploration & Expansion
Count Theodosius the Elder is appointed commander of an expedition to suppress the rebellion of Firmus in Mauretania.source
Religion & Belief
Saint Martin of Tours undertakes the Christianization of Gaul.source
Quintus Aurelius Symmachus becomes proconsul of Africa, and is made a member of the pontifical college.source
Emperor Valens is converted to Arianism, and orders the persecution of Trinitarian Christians in the Roman East.source
Births
Murong Sheng (or Daoyun), Chinese emperor of the Later Yan Dynasty (d. 401)source
Murong Hui, Chinese general and prince of the Later Yan Dynasty (d. 397)source
Synesius of Cyrene, Christian bishop (approximate date)source
Deaths
May 2 – Athanasius of Alexandria, Egyptian bishop and saint (b. 296)source
June 9 – Ephrem the Syrian, Syrian Orthodox priest and saint (b. 306)source
Huan Wen (or Yuanzi), Chinese general and regent (b. 312)source
Sun Sheng, Chinese historian and politician (b. 302)source
Nerses I (the Great), Armenian catholicos (or patriarch)source