St. Thomas Aquinas
St. Thomas Aquinas was a Catholic priest, Dominican friar, theologian, and philosopher. He wrote and taught during what is known as the high medieval period. He held a Chair as Master of Theology at the University of Paris from 1256-1259 and again from 1269-1272. Around the end of his first assignment as Master of Theology at Paris he began one of his most well-known works, theSumma Contra Gentiles, which he authored, in part, to aid in training missionaries. A chief aim of the work was to show how far human reason can proceed in knowledge of God without reliance on divine revelation.
The Literary Encyclopedia.