He was one of the greatest philosophers of the Middle Ages, coming at the beginning of the great flowering that came with the rediscovery of the works of Aristotle. He had a great interest in science and astronomy and his learning gave him the title, as a Doctor of the Church, of Doctor Universalis, the “Universal Doctor.”
In 1260 the Pope made him Bishop of Regensburg, a post that he held for three years before resigning it. He made great efforts to secure peace between people and between cities. He died at Cologne in 1280.
