<P> During the reign of the Roman Emperor Constantine the Great ( 306 -- 337 AD ) , Christianity began to transition to the dominant religion of the Roman Empire . Historians remain uncertain about Constantine 's reasons for favoring Christianity , and theologians and historians have often argued about which form of Early Christianity he subscribed to . There is no consensus among scholars as to whether he adopted his mother Helena 's Christianity in his youth , or , as claimed by Eusebius , encouraged her to convert to the faith himself . Some scholars question the extent to which he should be considered a Christian emperor : `` Constantine saw himself as an ' emperor of the Christian people ' . If this made him a Christian is the subject of ... debate , '' although he allegedly received a baptism shortly before his death . </P>
<P> During the reign of the Roman Emperor Constantine the Great ( 306 -- 337 AD ) , Christianity began to transition to the dominant religion of the Roman Empire . Historians remain uncertain about Constantine 's reasons for favoring Christianity , and theologians and historians have often argued about which form of Early Christianity he subscribed to . There is no consensus among scholars as to whether he adopted his mother Helena 's Christianity in his youth , or , as claimed by Eusebius , encouraged her to convert to the faith himself . Some scholars question the extent to which he should be considered a Christian emperor : `` Constantine saw himself as an ' emperor of the Christian people ' . If this made him a Christian is the subject of ... debate , '' although he allegedly received a baptism shortly before his death . </P>
who reigned when christianity was adopted as the official religion of the roman empire
who reigned when christianity was adopted as the official religion of the roman empire
Roman Emperor Constantine the Great
Roman Emperor Constantine the Great