Priscillian

Priscillian, the founder of a Gnostic heresy, was a Spaniard of noble birth. Some time after his ordination as Bishop of Avila he began to be suspected of heretical views, and at the Synod of Saragossa in 381 he was excommunicated. He and his three chief followers appealed in vain to the Pope at Rome; but the sect he had founded continued to flourish till, after having been again condemned, they were put to death at Treves in 385 after a futile appeal to Cajsar. The Priscillianist sect continued to exist for more than sixty years after this.