During the first years of Hilary’s episcopate there was civil turmoil in Gaul, but the Church was at peace. While the Eastern ruler Constantius favoured the Arians, partly misled by unprincipled advisers and partly guided by an unwise, though honest, desire for compromise in the interests of peace, his brother Constans, who reigned in the West, upheld the Catholic cause, to which the immense majority of his clergy and people was attached. He was slain in January, 350, by the usurper Magnentius, who, with whatever motives, took the same side. It was certainly that which would best conciliate his own subjects; but he went further, and attempted to strengthen his precarious throne against the impending attack of Constantius by negotiations with the discontented Nicene Christians of the East. He tried to win over Athanasius, who was, however, too wise to listen; and, in any case, he gained nothing by tampering with the subjects of Constantius. Constantius defeated Magnentius, pursued him, and finally slew him on the 11th August, 353, and was then undisputed master not only of the East but of the West, which he proceeded to bring into ecclesiastical conformity, as far as he could, with his former dominions.