Sounds a lot like the action of Justinian in calling the Council of Nicea in 325 A.D. to synthesize all the variations of gospels and ‘canons of belief’ into a standard set of approved orthodoxy beliefs about various versions of Christianity.
The First Council of Nicaea in 325 was called by Constantine I. Justinian reigned from 527 to 565. He called a council too (Constantinople II, in 553) but it isn’t as famous or important as Nicaea I.