The studies in this collection comprise a series of explorations into the revolutionary character of the Almohad movement in medieval North Africa and Spain and how it was expressed, including through compelling visual and auditory means. Almohad silver coins were minted square instead of round, and they carried no date, as if to indicate that a new era had begun. The new age was symbolized in the texts appearing on the coins, reminding Muslims that 'God is our Lord, Muhammad is our Prophet, the Mahdi is our imam', and that a new caliphate had begun. Almoravid mosques were purified and...