In the summer of 357, Ursacius and Valens, the advocates of this latter group of dissidents in the West, through the influence which they were enabled to bring to bear upon the Emperor by means of his second wife, Aurelia Eusebia (Panegyr. Jul. Orat., iii; Ammianus, XXI, vi, 4), succeeded in bringing about a conference of bishops at Sirmium.