Priscillian of Avila was the first Gnostic martyr, he was executed for heresy by the church. Ironically, he may also be at the end of one of the most famous pilgrimages in Europe since the middle ages.
A number of years ago, Lance Owens, medical doctor, historical scholar, and Gnostic priest, went on a pilgrimage in Spain--walking the Caminio de Santiago, the way of St. James. It was a journey filled with wonder and wonderful companions, from which he brought back enthralling stories. During the journey he spoke with a fellow pilgrim about Priscillian, planting the seed of an idea that has now grown into the novel Pilgrimage to Heresy.
More information is at http://pilgrimagetoheresy.com
Also see the new article on Amapedia