阴水猪年 (female Water-Pig) 490 or 109 or −663 — to — 阳木鼠年 (male Wood-Rat) 491 or 110 or −662
Year 364 (CCCLXIV) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Varronianus (or, less frequently, year 1117 Ab urbe condita). The denomination 364 for this year has been used since the early medieval period, when the Anno Dominicalendar era became the prevalent method in Europe for naming years.[1][2]
March 28 – Valens, brother of Valentinian I, is appointed co-emperor (Augustus) in the palace of Hebdomon (Turkey). He rules the Eastern portion of the Roman Empire, from the Danube to the Persian border, and begins the first anti-pagan persecutions.
Britain is forced to endure fierce barbarian raids.