Thus, then, all whom the process embraced were brought before the king. The bishops Ydacius and Ithacius followed as accusers; and I would by no means blame their zeal in overthrowing heretics, if they had not contended for victory with greater keenness than was fitting. And my feeling indeed is, that the accusers were as distasteful to me as the accused. I certainly hold that Ithacius had no worth or holiness about him. For he was a bold, loquacious, impudent, and extravagant man; excessively devoted to the pleasures of sensuality.
He proceeded even to such a pitch of folly as to charge all those men, however holy, who either took delight in reading, or made it their object to vie with each other in the practice of fasting, with being friends or disciples of Priscillian. The miserable wretch even ventured publicly to bring forward a disgraceful charge of heresy against Martin, who was at that time a bishop, and a man clearly worthy of being compared to the Apostles. For Martin, being then settled at Treves, did not cease to importune Ithacius, that he should give up his accusations, or to implore Maximus that he should not shed the blood of the unhappy persons in question.
He maintained that it was quite sufficient punishment that, having been declared heretics by a sentence of the bishops, they should have been expelled from the churches; and that it was, besides, a foul and unheard-of indignity, that a secular ruler should be judge in an ecclesiastical cause. And, in fact, as long as Martin survived, the trial was put off; while, when he was about to leave this world, he, by his remarkable influence, obtained a promise from Maximus, that no cruel measure would be resolved on with respect to the guilty persons.
But subsequently, the emperor being led astray by Magnus and Rufus, and turned from the milder course which Martin had counseled, entrusted the case to the prefect Evodius, a man of stern and severe character. He tried Priscillian in two assemblies, and convicted him of evil conduct. In fact, Priscillian did not deny that he had given himself up to lewd doctrines; had been accustomed to hold, by night, gatherings of vile women, and to pray in a state of nudity. Accordingly, Evodius pronounced him guilty, and sent him back to prison, until he had time to consult the emperor. The matter, then, in all its details, was reported to the palace, and the emperor decreed that Priscillian and his friends should be put to death.
Source: Sacred History (New Advent)