Around the time of his rise to power, there was a civil war between pagans and christians. His loyalty was obvious;
"Constantine entered Rome on 29 October.
[162] He staged a grand
adventus in the city, and was met with popular jubilation.
[163] Maxentius' body was fished out of the Tiber and decapitated. His head was paraded through the streets for all to see.
[164] After the ceremonies, Maxentius' disembodied head was sent to
Carthage, after which Africa gave no further resistance.
[165] He entered as a Christian: unlike his predecessors, he neglected to make the trip to the
Capitoline Hill and perform customary sacrifices at the
Temple of Jupiter."
This was the start of his "Christian rule."
Constantine is perhaps best known for being the first Christian Roman Emperor. His reign was a turning point for the Christian Church. In 313 Constantine announced toleration of Christianity in the
Edict of Milan, which removed penalties for professing Christianity (under which many had been martyred in previous
persecutions of Christians) and returned confiscated
Church property. Though a similar edict had been issued in 311 by
Galerius, then senior emperor of the
Tetrarchy, Galerius' edict granted Christians the right to practice their religion but did not restore any property to them.
[191]
Prior to 313 CHristianity involved a lot of pain.