Constantine the Great
Constantine the Great, also known as Constantine I, was a Roman Emperor who ruled between AD 306 and 337. Born in Naissus, in Dacia Ripensis, the city now known as Niš, he was the son of Flavius Valerius Constantius, a Roman Army officer of Illyrian origins. His mother, Helena, was Greek. His father became Caesar, the deputy emperor in the west, in AD 293. Constantine was sent east, where he rose through the ranks to become a military tribune under Emperors Diocletian and Galerius. In 305, Constantius was raised to the rank of Augustus, senior western emperor, and Constantine was recalled west to campaign under his father in Britannia (Britain). Constantine was acclaimed as emperor by the army at Eboracum after his father's death in AD 306. He emerged victorious in the civil wars against Emperors Maxentius and Licinius to become sole ruler of the eastern and western empires by AD 324.