Frederick I1 was an odd man to lead a crusade--a free-thinker and heretic who, having driven two popes to despair, was excommunicated by a third, Gregory IX.

• 领导十字军的腓特烈是个古怪的人，一个自由的思想家和异教徒，由于使两个教皇陷于绝境而被第三个教皇格列高利九世处以绝罚。