 Francisco de Vitoria (1486–1546) is usually regard as a late Scholastic, who employed Aristotelian thought in his philosophy and theology. Although Spanish Scholastics like Vitoria were primarily theologians, the topics they discussed went far beyond the limits of theology and even of the traditional philosophical companions of theology, such as metaphysics and logic. This is partly because Dominican theologians had to comment on the Summa theologiae of Thomas Aquinas (Sancti Thomae Aquinatis Doctoris Angelici Opera Omnia, volumes 4-12), with all the different topics it covered. The fifteenth and sixteenth centuries saw a revival of Thomism in Paris, Rome, and Salamanca. In Rome, Thomas de Vio (Cajetan) wrote the most influential commentary on the Summa theologiae. In Paris, Peter Crockaert, a pupil of John Mair, joined the Dominican order and became a zealous Thomist. Francisco de Vitoria, who studied in Paris, embraced this Thomist revival. When he began teaching in Salamanca in 1524, he supplemented Peter Lombard’s Sentences with the Summa theologiae as the textbook for the study of theology. Although the University of Salamanca was not a new foundation, Vitoria and his disciples, especially Domingo de Soto (1494–1560) and Melchior Cano (1509–1560), transformed it into a center for a revived Scholasticism, applying Thomism to such practical problems as the evangelization of the indigenous populations of the New World and the legality of slavery. In addition, the Dominicans of Castile influenced the intellectual development of the fledgling Jesuit order, which produced such luminaries as Luis de Molina (1535–1600) and Francisco Suárez (1548–1617).