<P> Constantine 's decision to cease the persecution of Christians in the Roman Empire was a turning point for early Christianity , sometimes referred to as the Triumph of the Church , the Peace of the Church or the Constantinian shift . In 313 , Constantine and Licinius issued the Edict of Milan decriminalizing Christian worship . The emperor became a great patron of the Church and set a precedent for the position of the Christian emperor within the Church and the notion of orthodoxy , Christendom , ecumenical councils , and the state church of the Roman Empire declared by edict in 380 . He is revered as a saint and isapostolos in the Eastern Orthodox Church , Oriental Orthodox Church , and various Eastern Catholic Churches for his example as a `` Christian monarch . '' </P>
<P> Constantine 's decision to cease the persecution of Christians in the Roman Empire was a turning point for early Christianity , sometimes referred to as the Triumph of the Church , the Peace of the Church or the Constantinian shift . In 313 , Constantine and Licinius issued the Edict of Milan decriminalizing Christian worship . The emperor became a great patron of the Church and set a precedent for the position of the Christian emperor within the Church and the notion of orthodoxy , Christendom , ecumenical councils , and the state church of the Roman Empire declared by edict in 380 . He is revered as a saint and isapostolos in the Eastern Orthodox Church , Oriental Orthodox Church , and various Eastern Catholic Churches for his example as a `` Christian monarch . '' </P>
when did rome make christianity the religion of the empire
when did rome make christianity the religion of the empire
380
380