Almohads (ăl´məhădz), Berber Muslim dynasty that ruled Morocco and Spain in the 12th and 13th cent. It had its origins in the puritanical sect founded by Ibn Tumart, who stirred up (c.1120) the tribes of the Atlas Mts. area to purify Islam and oust the Almoravids. His successors, Abd al-Mumin, Yusuf II, and Yakub I, succeeded in conquering Morocco and Muslim Spain, and by 1174 the Almohads had completely displaced the Almoravids. With time the Almohads lost some of their fierce purifying zeal; Yakub had a rich court and was the patron of Averroës. Yakub defeated (1195) Alfonso VIII of Castile in the battle of Alarcos, but in 1212 the Almohad army was defeated, and Almohad power in Spain was destroyed by the victory of the Spanish and Portuguese at Navas de Tolosa. In Morocco they lost power to the Merinid dynasty, which took Marrakech in 1269.
See studies by Abd al-Wahid al Marrakushi 1881, repr. 1968) and R. Le Tourneau (1969).