User blog comment:Deyuaru/Research Notes on "Camelot"/@comment-27996510-20160409152114/@comment-11658422-20160410103007

Technically 1273 is the truce period between Mamluks and Crusaders. The leader of the crusaders (Edward I of England) during that time is on his way to home.

By the way, the said truce is also the result of the last major crusade or maybe if you disagree, the last crusade to Jerusalem. The following crusades is just crusade in-name only.