In the 12th century arose a new religious movement of the most rigorous observance among the Masmuda Berbers of the High Atlas. Its adherents called themselves Almohads (from al-Muwahhidun = those who affirm the unity of God). In 1147 AD they conquered Marrakech and soon thereafter controlled the entire western part of the Islamic world. The Almohads introduced a new denomination that became soon known under its Spanish name, "la dobla." Its weight lay between 4.46 and 4.70 grams; this dinar is thus a half piece. The dobla had an entirely new design: on both faces a square was set within the circle.