Licinius

Licinius rose to emperor in 308, ruling the eastern half of the Roman Empire while Constantine held the west. Around 313, the two co-authored the Edict of Milan, granting official toleration to Christians across the empire. For over a decade they governed as colleagues and competitors, the tension building until it broke into open conflict. In 324, Constantine's forces defeated Licinius at the Battle of Chrysopolis. Shortly after, Constantine ordered his former partner executed, consolidating sole rule over Rome.