In the scholastic tradition of Saint Thomas Aquinas, a number of whose doctrines have been incorporated into Roman Catholic dogma, the soul is the substantial form of a human being. Aquinas held the "Quaestiones disputate de anima", or 'Disputed questions on the soul', at the Roman "studium provinciale" of the Dominican Order at Santa Sabina, the forerunner of the Pontifical University of Saint Thomas Aquinas, "Angelicum" during the academic year 1265–66. By 1268 Aquinas had written at least the first book of the "Sententia Libri De anima", Aquinas' commentary on Aristotle's "De anima", the translation of which from the Greek was completed by Aquinas' Dominican associate at Viterbo William of Moerbeke in 1267. Like Aristotle, Aquinas held that the human being was a unified composite substance of two substantial principles: form and matter. The soul is the substantial form and so the first actuality of a material organic body with the potentiality for life.