GILBERT DE LA PORREE (c. scholastic logician and theologian, was born at Poitiers, and educated under Bernard of Chartres and Anselm of Laon. After teaching for some 12 years in Chartres, he lectured in Paris (from 1137), and in 1142 became bishop of Poitiers. Gilbert's association with Abelard, and his heterodox opinions regarding the Trinity, led to his being attacked by Bernard of Clairvaux at the Synod of Reims in 1148, but he escaped formal condemnation. He returned to his diocese where he died on Sept. 4, 1154. His celebrated De sex principiis, often quoted by his successors, seeks to complete Aristotle's study of the categories, substance, quantity, quality and relation by an account of the remaining six, when, where, action, passion, position and habit, called f ormas assistentes. His tend ency towards extreme realism led him in his commentary on the De Trinitate of Boethius to come near to the theological heresy of tritheism. For him, the pure form of existence, that by which God is God, must be distinguished from the three persons who are God by participation in this form, which is to say, Deitas or Divinitas must be distinguished from Deus. In the same com mentary he proclaims a negative theology, the simplicity of God making it impossible for Him to possess two factors one of which could be predicated of the other.