Constantine and the Donatis

As queen zenobia was extending her flence into syria, she made common cause with a controversial bishop named paul of samacida. A delegation of christian leaders approached arelion and asked him to expel paul from the city since their religious aims coincided with his political aims. Aurelian granted the request and paul was exiled. That, so far as i can tell, is actually the first time an emperor got in the middle of what was really an internal dispute between a christian factions. But that all being said, no emperor had ever gotten involved with doctrinal issues, so constantine is definitely about to set off into uncharted territory on that front.