* [[Constantine]] the Great ''(311-337)''. He was the first man since Diocletian to rule the entire empire, and the first emperor to publicly adopt [[Christianity]]. He moved the Imperial capital from [[Rome]] to [[Constantinople]].
* [[Constantine]] the Great ''(311-337)''. He was the first man since Diocletian to rule the entire empire, and the first emperor to publicly adopt [[Christianity]]. He moved the Imperial capital from [[Rome]] to [[Constantinople]].
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* Constantine left the empire to his three sons, [[Constantine II]] ''(337-340)'', [[Constans I]] ''(337-350)'', and [[Constantinus II]] ''(337-361)''. However, they fought among themselves, and the army soon rebelled. Emperors after them include:
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* Constantine left the empire to his three sons, [[Constantine II]] ''(337-340)'', [[Constans I]] ''(337-350)'', and [[Constantius II]] ''(337-361)''. However, they fought among themselves, and the army soon rebelled. Emperors after them include:
* [[Magentius]], [[Nepotian]], [[Vetranio]], and [[Silvanus]], who rebelled with some success against Constantine's sons.
* [[Magentius]], [[Nepotian]], [[Vetranio]], and [[Silvanus]], who rebelled with some success against Constantine's sons.
* [[Julian]] the Apostate ''(361-363)'', Constantine the Great's nephew.
* [[Julian]] the Apostate ''(361-363)'', Constantine the Great's nephew.