Alexander Of Hales, an English theologian, surnamed the Irrefragable Doctor, died Aug. 27, 1245. A great part of his life was passed at Paris, where he taught philosophy and theology.

In 1222 he became a Franciscan monk, and was the first of his order to retain his doctorate in the university. Bonaventura was his pupil, and perhaps also Aquinas. His chief work was his Summa Theologiae, which, after being examined and approved by a committee of 70 doctors, was accepted as a complete manual of instruction in theology for all institutions of learning in Christendom.