In late March 1265 Sultan Baibars, Muslim ruler of the Mamluks, laid siege to Arsuf. It was defended by 270 Knights Hospitallers. At the end of April the town surrendered. However, the Knights remained in their formidable citadel. Baibers convinced the Knights to surrender by agreeing to let them go free. Baibers reneged on this promise immediately, taking the knights into slavery. {{Campaignbox Crusades Battles}}{{siege-stub}} 6 : Sieges involving the Mamluk Sultanate (Cairo)|Conflicts in 1265|1265 in Asia|Battles of the Crusades|13th century in the Mamluk Sultanate (Cairo)|Period post Seventh Crusade |