344

Year 344 was a leap year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Leontius and Bonosus. The denomination 344 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

The Eastern Roman Emperor Constantius II campaigns in eastern Mesopotamia, against the Sassanid Persians.
Battle of Singara: The Roman army under Constantius wins a close victory, at the strongly fortified city of Singara. His enemy, King Shapur II, is forced to lift the siege, and withdraw the Persian army.
Shapur II, for the second time, besieges the Roman fortress of Nisibis in eastern Mesopotamia, but is repulsed by forces under General Lucilianus.
Asia
Jin Mudi, age 1, succeeds his father Jin Kangdi as emperor of China. His mother, Empress Dowager Chu, becomes the ruling authority at court, and serves as regent.
Gye becomes king of the Korean kingdom of Baekje.
By topic

The making of a detail of Admonitions of the Imperial Instructress to Court Ladies begins and is completed in 406. It is now kept at the British Museum, London.
Religion
Bishop Eustorgius I brings relics of the Three Magi from Constantinople to Milan, according to a 12th century legend.