In 1229, the city of Valencia, known to the Muslims as "Balansiya", had fallen to the forces under the command of Zayyan ibn Mardanish, a local leader who was opposed to the Almohades. In capturing that city, he dethroned Zayd Abu Zayd, who subsequently fled to the Kingdom of Aragon. James I of Aragon used this as a casus belli to intervene in the Muslim civil war on the side of the Almohades, but in reality with the pretext of expanding his own territory.