The Sixth Crusade regains Jerusalem
The Holy Roman Emperor Frederick II (1194-1250) was one of the most remarkable men of the Middle Ages, known in his own time as “Stupor Mundi”, the “Wonder of the World”. His attempts to dominate both Germany and Italy attracted the hostility of the papacy, an antipathy which would lead in the long run to the gutting of the Empire. He was excommunicated four times, called the “Antichrist” by a pope and showed suspicious favour to Muslims, but went on Crusade and regained Jerusalem for Christendom.
The spirit of crusading was still alive in Europe despite the disgraceful Fourth Crusade which never reached the Holy Land and ended up sacking Christian Constantinople instead. Frederick in 1220 promised to go on the Fifth Crusade launched at the Muslim stronghold in Egypt but he never appeared. The failure of that expedition was therefore laid at his feet. He promised the pope that he would lead another crusade by 1227 but when that seemed as if it would not materialize, he was excommunicated by Gregory IX.
Finally in 1229 Frederick arrived on the strip of the eastern Mediterranean coast still held by Christian forces. He discovered that he need not fight for Jerusalem and that the local Muslim leader, preoccupied by other wars, was wiling to offer Jerusalem, Bethlehem and a 10 year truce. Unfortunately the Church was not impressed by this action which had been carried out without its approval and Frederick quarrelled with local crusader barons. He left the Holy Land holding a disputed claim to the Kingdom of Jerusalem and still excommunicated. Jerusalem soon fell back into Muslim hands.