The Crusades, which started late in the 11th century, bred the religious ideology of a Christian reconquest, confronted at that time with a similarly staunch Muslim jihad ideology in Al-Andalus by the Almoravids, and to an even greater degree by the Almohads. In fact, previous documents from the 10th and 11th centuries are mute on any idea of "reconquest". Accounts of Muslim-Christian hostility came into being to support that idea, most notably the "Chanson de Roland", a fictitious 11th-century French version of the Battle of Roncevaux Pass (778) dealing with the Iberian "Saracens" ("Moors"), and taught as historical fact in the French educational system since 1880.