His successor Muhammad I al-Mustansir (1249–1277) proclaimed himself Caliph in 1256 and continued the policies of his father and extended the boundaries of his State by subjugating the central Maghreb, going so far as to impose his overlordship over the Kingdom of Tlemcen, northern Morocco and the Nasrids of Granada Spain. The Hafsids become completely independent in 1264. It was during his reign that the failed Eighth Crusade took place, led by St. Louis. After landing at Carthage, the King died of dysentery in the middle of his army decimated by disease in 1270.