The Battle of Arsuf was a battle of the Third Crusade in which Richard I of England (Richard the Lionheart) defeated Saladin (Ṣalāḥ al-Dīn Yūsuf ibn Ayyūb), founder of the Ayyubid dynasty and Sultan of Egypt and Syria, at Arsuf in Palestine. The forces of the Third Crusade had taken the city of Acre after a prolonged siege.