The definitive account of the life and thought of the medieval Arab genius who wrote the MuqaddimaIbn Khaldun (1332–1406) is generally regarded as the greatest intellectual ever to have appeared in the Arab world―a genius who ranks as one of the world's great minds. Yet the author of the Muqaddima, the most important study of history ever produced in the Islamic world, is not as well known as he should be, and his ideas are widely misunderstood. In this groundbreaking intellectual biography, Robert Irwin provides an engaging and authoritative account of Ibn Khaldun's extraordinary life, times, writings, and ideas.