The friction between the Arian Christianity of the Visigoths and the Catholicism of the bishops sent out from Rome established deep roots for religious heterodoxy, even heresy, in Occitan culture. At Treves in 385, Priscillian achieved the distinction of becoming the first Christian executed for heresy (Manichaean in his case, see also Cathars, Camisards). Despite this tension and the city's decline in the face of barbarian invasions, Arles remained a great religious centre. It hosted church councils (see Council of Arles), the rival of Vienne, for hundreds of years.