ナバス・デ・トロサの戦い
He now had to turn his attention back to Iberia, to deal with a crusade proclaimed by Pope Innocent III. This resulted in his defeat by a Christian coalition at the Battle of Las Navas de Tolosa (1212). He died the following year, and was succeeded by his young son Yusuf al-Mustansir, born of Christian slave Qamar.