Constantine I, also known as Constantine the Great became emperor on this day when acclaimed emperor by his troops. Whilst he was campaigning against the Picts in Britain with his father.
Apparently just before his death Constantine’s father Constantius, who had become really ill, declared his support for Canstantine to be made Augustus. After his promotion to emperor, Constantine remained in Britain, driving back the tribes of the Picts, and then successfully fought the Franks. Constantine the first professed Christian emperor was involved in a civil war to maintain his authority.
Constantine entered Rome on 29 October 312 to popular acclaim with Maxentius’ head paraded through the streets.