Messianic/Hebrew Roots people frequently discus Constantine the Greats conversion to Christianity, whether it was genuine or faked. Since so much of the Church’s departure from the teachings of the Bible stem from this period.
There are two references to Constantine’s Conversion in Phillip Schaff’s The History of the Christian Church.
He has a full quote from Lactantius who was an eye witness to the events at the Milvian bridge, as he was Constantine’s son Crispus’ tutor.
The other is in vol. 3, Nicene and Post-Nicene Christianity A.D. 311-600 .
Read them both and you can decide for yourself if he was a true convert or a cleaver politician.