364

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364 is a leap year starting on Thursday of the Julian calendar. It is also known as year 1117 Ab urbe condita and the Year of the Consulship of Augustus and Varronianus.

In the Roman Empire, Emperor Jovian died on February 17 while traveling to Constantinople. On February 26, Valentinian I was proclaimed Western Emperor at Nicaea, founding the Valentinian dynasty and ruling from Lutetia (Paris) to the Rhine. On March 28, Valens was named co-emperor of the Eastern Empire, ruling from the Danube to the Persian border and starting anti-pagan actions. Britain faced fierce barbarian raids.

In religion, the Council of Laodicea attempted to set church canons but failed. In science, Theon of Alexandria observed a solar eclipse on June 16 and a lunar eclipse on November 25.

Notable births include Blaesilla, Huiguo the Buddhist nun, Sima Daozi, and Xu Xianzhi. Notable deaths include Jovian, Ge Hong, and Theophilos the Indian.