عبد المؤمن بن علي
Abd al-Mu'min created his empire by first winning control of the high Atlas Mountains, then the Middle Atlas, into the Rif region, eventually moving into his homeland north of Tlemcen. In 1145, after the Almoravids lost the leader of their Catalan mercenaries, Reveter, the Almohads defeated them in open battle. From this point the Almohads moved west onto the Atlantic coastal plain. After laying siege to Marrakesh, they finally captured it in 1147. Traditional accounts state that after establishing his capital at Marrakesh, Abd al-Mu'min created a dilemma in that the Almohads considered it a city of heretics. He contented himself with the destruction of their palace and mosques, although it is not clear whether these were actually demolished or merely abandoned.