Years: 246 247 248 249 - 250 - 251 252 253 254

Decades: 220s 230s 240s - 250s - 260s 270s 280s

Centuries: 2nd century - 3rd century - 4th century

Events

• Diophantus writes Arithmetica the first systematic treatise on algebra.
• A group of Franks penetrate as far as Tarragona in Spain (approximate date).
• Goths invade Moesia.
• The Alamanni drive the Romans from the modern area of Donau-Ries.
• Decius begins a period of persecution of the Christians in the Roman Empire.

Births

• Maximian, Roman emperor (approximate date)
• 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
• Saint Alban, Christian saint