While _Damasus_, and the other Western Bishops, were wholly intent upon suppressing the Heresy of _Apollinaris_, and restoring the Eastern Churches to their former Tranquillity, the Antipope _Ursinus_, laying hold of that Opportunity, arrived privately at _Milan_, and there joined the _Arians_, upon their promising to support him with the whole Power of their Party[1116]. But _Ambrose_, who then governed that Church, and kept a watchful Eye over the Flock committed to his Care, gave immediate Notice of their clandestine Meetings, and pernicious Designs, to the Emperor _Gratian_, who soon after ordered _Ursinus_ to quit _Italy_, and confined him to _Cologne_[1117]. During his Exile his Partisans were not idle; they found the Emperor _Gratian_, who in 375. had succeeded his Father _Valentinian_ I. warmly engaged in favour of _Damasus_: they well knew, that so long as he continued in that Disposition, it would be in vain to solicit the Return of _Ursinus_, or to put up any Petition in his Behalf. [Sidenote: Damasus _falsly accused, but cleared by the Emperor_.] In order therefore to estrange the Mind of the Emperor from _Damasus_, they suborned a _Jew_, named _Isaac_, who had embraced the Christian Religion, but was then returned to Judaism, to accuse him before the Civil Magistrate of an heinous Crime, which I find not specified by any of the Antients. But the Emperor, taking upon himself the judging of that Cause, soon discovered the Innocence of the Accused, and the Malice of the Accuser; and therefore, honourably acquitting the former, and punishing the latter according to his Deserts, confined him to a Corner of _Spain_[1118].