Murabit Yusuf Khalifah, later to be Grand Sharif Yusuf I of the Almoravid Empire was, by the standards of both previous and successive Berber rulers, a great man. During the 15 years that he ruled the Maghreb, conquered in its entirety by 1062, he set the foundations for a great and wealthy state, that was set to dominate the Maghreb for 80 years.