When was Constantine I born?
Constantine the Great
27 February c. 272 AD
Constantine the Great (Latin: Flavius Valerius Aurelius Constantinus Augustus; Greek: Κωνσταντῖνος ὁ Μέγας; 27 February c. 272 AD[1] – 22 May 337 AD), also known as Constantine I, was a Roman Emperor who ruled between 306 and 337 AD.  Born on the territory now known as Niš (Serbian Cyrillic: Ниш, located in Serbia), he was the son of Flavius Valerius Constantius, a Roman Army officer.  His mother was Empress Helena.  His father became Caesar, the deputy emperor in the west, in 293AD.  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 (modern-day York) after his father's death in 306 AD.  He emerged victorious in a series of civil wars against Emperors Maxentius and Licinius to become sole ruler of both west and east by 324AD.