- Aquinas, Saint Thomas 1225-1274. Italian Dominican friar, theologian, and philosopher. The most influential thinker of the medieval period, his philosophy combined Aristotelianism and elements of Neo-Platonism within a context of Christian thought. His works include the Summa contra gentiles (1259-1264) and the Summa theologiae or theologica (1266-1273).
- (Roman Catholic Church) Italian theologian and Doctor regarding the Church who is remembered for his make an effort to get together again belief and reason in an extensive theology; provided philosophical proofs for the existence of God (1225-1274)