a Crusade from 1228 to 1229 led by the Holy Roman Emperor Frederick II who was therefore excommunicated by the Pope; by negotiation Frederick was able to crown himself king of Jerusalem.

• 1228年到1229年由神圣罗马帝国皇帝弗雷德里克二世领导东侵，为此他被罗马教皇逐出教会；通过谈判弗雷德里克二世加冕自己为耶路撒冷的皇帝。