阴水猪年 (female Water-Pig) 430 or 49 or −723 — to — 阳木鼠年 (male Wood-Rat) 431 or 50 or −722
Year 304 (CCCIV) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. It was known in the Roman Empire as the Year of the Consulship of Diocletian and Maximian (or, less frequently, year 1057 Ab urbe condita). The denomination 304 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.
Events
By place
Roman Empire
Caesar Galerius, perhaps accompanied by Emperor Diocletian, wins his fourth and final victory over the Carpi. Many of the surviving Carpi and Bastarnae are resettled in the Roman Empire, where they are split up. The Bastarnae are not attested after this time, and the Carpi are attested only once more in the 310s.
Diocletian, while inspecting the Danube border, becomes seriously ill.
Caesar Constantius I besieges a Germanic raiding force on an island in the Rhine and forces their surrender.