He played an important role during the evolving controversies surrounding the legacies of the Council of Nicaea and the theologian Arius, acting frequently in concert with his fellow bishops of the Diocese of Pannonia (or "Illyria"), Germinius of Sirmium and Valens of Mursa.
Found at various times during their episcopal careers staking positions on both sides of the developing theological debate and internal Church politicking, Ursacius and his fellows were seen to vacillate according to the political winds.
[2] The endorsement by the group of the fabricated charges made against Athanasius is generally attributed to their partisanship for the theology of Arius.
Accordingly, they journeyed to Rome, presenting a written recantation to its bishop, Julius, and wrote to Athanasius, expressing their willingness to hold communion with him in the future.
[5] Found at various times during their episcopal careers staking positions on both sides of the developing theological debate and internal Church politicking, Ursacius and his fellows were seen by contemporaneous and later Church history sources (such as Socrates of Constantinople) to vacillate according to the political winds, being 'always inclined to side with the dominant party.