chief of the West African Lamtuna, one of the Sanhaja Berber peoples, and leader of the Almoravid movement that eventually conquered Morocco, western Algeria, and Islamic Spain in the north and Mauritania and portions of Mali in the south. Although he became leader of the Almoravids following the death of the movement’s founder, ʿAbdallah ibn Yasin, in 1059, his notoriety was surpassed by that of his cousin, Yusuf ibn Tashfin. Yusuf would lead the Almoravids to multiple conquests in the north, while Abu Bakr remained with his Sanhaja warriors in the south, where he continued to lead jihad against the infidels of sub-Saharan West Africa. His accomplishments included defeating the kingdom of Ghana, but he was never able to establish full Almoravid control in the region. Abu Bakr ibn ʿUmar was killed in battle in 1087, after which Almoravid authority in the south rapidly disintegrated.
The Almoravid movement ...