May 27 Marcellus I begins his reign as Catholic Pope, serving until his death in 309
Nov 11 The Congress of Carnuntum: Attempting to keep peace within the Roman Empire, the leaders of the Tetrarchy declare Maxentius and Licinius to be Augusti, while rival contender Constantine I is declared Caesar of Britain and Gaul.
Augustus Caesar
Caligula
Constantine the Great
Julius Caesar
Mark Antony
Nero