Heortasius

In 358, the Roman Emperor Constantius II requested two councils, one of the western bishops held at Ariminum and one of the eastern bishops at Seleucia, to resolve the Arian controversy over the nature of the divinity of Jesus Christ, which divided the 4th-century church.

[1] The council at Seleucia was bitterly divided, and procedurally irregular, and the two parties met separately and reached opposing decisions.

Later that year, Constantius II called for a council in Constantinople to consider the decision at Ariminum and resolve the split at Seleucia.

[2][4] Here Constantius sided with Acacius and the semi-Arians, and several bishops of opposing factions were exiled.

[5][6] It seems probable however that in reality Acacius was taking the opportunity, using his imperial connections, to rid himself of long-standing enemies, especially Cyril of Jerusalem.