PRISCILLIANISTS, a theosophic sect, who arose in the Spanish church towards the close of the fourth century, and who professed tenets closely related to Gnosticism and Manichæism. Their founder Priscillian, a respectable and wealthy Spaniard, seems to have received the germ of his doctrines from one Marcus, who travelled thither from Memphis. (See Neander's History of the Church, vol. iv.)