In 1108 Tamim Al Yusuf defeated the Kingdom of Castile at the Battle of Uclés. Yusuf did not reconquer much territory from the Christian kingdoms, except that of Valencia; but he did hinder the progress of the Christian Reconquista by uniting al-Andalus. In 1134 at the Battle of Fraga the Almoravids were victorious and even succeeded in slaying Alfonso I of Aragon in the battle.