<P> Constantine was the first Roman emperor to convert to Christianity , and he played an influential role in the proclamation of the Edict of Milan in 313 , which declared religious tolerance for Christianity in the Roman empire . He called the First Council of Nicaea in 325 , at which the Nicene Creed was adopted by Christians . In military matters , the Roman army was reorganised to consist of mobile field units and garrison soldiers capable of countering internal threats and barbarian invasions . Constantine pursued successful campaigns against the tribes on the Roman frontiers -- the Franks , the Alamanni , the Goths , and the Sarmatians -- even resettling territories abandoned by his predecessors during the Crisis of the Third Century . </P>
<P> Constantine was the first Roman emperor to convert to Christianity , and he played an influential role in the proclamation of the Edict of Milan in 313 , which declared religious tolerance for Christianity in the Roman empire . He called the First Council of Nicaea in 325 , at which the Nicene Creed was adopted by Christians . In military matters , the Roman army was reorganised to consist of mobile field units and garrison soldiers capable of countering internal threats and barbarian invasions . Constantine pursued successful campaigns against the tribes on the Roman frontiers -- the Franks , the Alamanni , the Goths , and the Sarmatians -- even resettling territories abandoned by his predecessors during the Crisis of the Third Century . </P>
he was roman emperor from 306-337 ce becoming the first emperor to convert to christianity
he was roman emperor from 306-337 ce becoming the first emperor to convert to christianity
Constantine
Constantine