Qalawun was the last Salihi sultan and following his death in 1290, his son,;al-Ashraf Khalil, drew his legitimacy as a Mamluk by emphasizing his lineage from Qalawun, thus inaugurating the Qalawuni period of Bahri rule. In 1291, Khalil captured Acre, the last major Crusader fortress in Palestine and thus Mamluk rule extended across the entirety of Syria. It is considered one of the most important battles of the period. Although the crusading movement continued for several more centuries, the capture of the city marked the end of further crusades to the Levant. When Acre fell, the Crusaders lost their last major stronghold of the Crusader Kingdom of Jerusalem.