And then Instantius, Salvianus, and Priscillian set out for Rome, in order that before Damasus who was at that time the bishop of the city, they might clear themselves of the charges brought against them. Well, their journey led them through the heart of Aquitania, and being there received with great pomp by such as knew no better, they spread the seeds of their heresy. Above all, they perverted by their evil teachings the people of Elusa, who were then of a good and religious disposition.
They were driven forth from Bordeaux by Delfinus, yet lingering for a little while in the territory of Euchrotia, they infected some with their errors. They then pursued the journey on which they had entered, attended by a base and shameful company, among whom were their wives and even strange women. In the number of these was Euchrotia and her daughter Procula, of the latter of whom there was a common report that, when pregnant through adultery with Priscillian, she procured abortion by the use of certain plants.
When they reached Rome with the wish of clearing themselves before Damasus, they were not even admitted to his presence. Returning to Milan, they found that Ambrose was equally opposed to them. Then they changed their plans, with the view that, as they had not got the better of the two bishops, who were at that time possessed of the highest authority, they might, by bribery and flattery, obtain what they desired from the emperor. Accordingly, having won over Macedonius, who was the master of public services, they procured a rescript, by which, those decrees which had formerly been made being trampled under foot, they were ordered to be restored to their churches.
Relying upon this, Instantius and Priscillian made their wayback to Spain (for Salvianus had died in the city); and they then, without any struggle, recovered the churches over which they had ruled.
Source: Sacred History (New Advent)