The nature and length of this "Golden Age" has been debated, as there were at least three periods during which non-Muslims were oppressed. A few scholars give the start of the Golden Age as 711–718, the Muslim conquest of Iberia. Others date it from 912, during the rule of Abd al-Rahman III. The end of the age is variously given as 1031, when the Caliphate of Córdoba ended; 1066, the date of the Granada massacre; 1090, when the Almoravids invaded; or the mid-12th century, when the Almohads invaded.