Events
Diophantus writes Arithmetica the number one orderly treatise in algebra. A class action of Franks penetrate when far as Tarragona in Spain (approximate date). Goths invade Moesia. The Alamanni drive a Romans from either the modern locality of Donau-Ries. Decius begins a period of persecution of the Christians in the Roman Empire.

Births
Maximian, Roman emperor (approximate date) Galerius Maximianus, Roman emperor, (approx) Constantius Chlorus, Roman emperor and father of Constantine the Great (approximate date) Licinius, Roman emperor (approximate date) Arius, Christian priest and namesake of Arianism

Deaths
January 20 - Pope Fabian Ambrose of Alexandria, Christian writer (approximate date) Denis, Christian saint Denise, Christian martyr Saint Alban, Christian saint

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