 Complete the following phrase:  His successor Muhammad I al-Mustansir 12491277 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 