In the meantime in the East, after the example of the West, the emperor ordered almost all the bishops to assemble at Seleucia, a town of Isauria. At that time, Hilarius, who was now spending the fourth year of his exile in Phrygia, is compelled to be present among the other bishops, the means of a public conveyance being furnished to him by the lieutenant and governor. As, however, the emperor had given no special orders regarding him, the judges, simply following the general order by which they were commanded to gather all bishops to the council, sent him also among the rest who were willing to go.
This was done, as I imagine, by the special ordination of God, in order that a man who was most deeply instructed in divine things, might be present when a discussion was to be carried on respecting the faith. He, on arriving at Seleucia, was received with great favor, and drew the minds and affections of all towards himself. His first inquiry was as to the real faith of the Gauls, because at that time the Arians had spread evil reports regarding us, and we were held suspected by the Easterns as having embraced the belief of Sabellius, to the effect that the unity of the one God was simply distinguished by a threefold name.
But after he had set forth his faith in harmony with those conclusions which had been reached by the fathers at Nicæa, he bore his testimony in favor of the Westerns. Thus the minds of all having been satisfied, he was admitted to communion, and being also received into alliance, was added to the council. They then proceeded to actual work, and the originators of the wicked heresy being discovered, were separated from the body of the Church. In that number were Georgius of Alexandria, Acacius, Eudoxius, Vranius, Leontius, Theodosius, Evagrius, Theodulus.
But when the Synod was over, an embassy was appointed to go to the emperor and make him acquainted with what had been done. Those who had been condemned also went to the prince, relying upon the power of their confederates, and a common cause with the monarch.
Source: Sacred History (New Advent)