ABSTRACT
The Sixth Crusade was unique among the nine crusades, as well as among the crusades in Europe such as the Baltic and Cathar crusades, in that it was the only one whose goal was won peacefully. In 1210, Jean de Brienne, "King of Jerusalem", had married Maria del Monferrato, daughter of Isabella and Conrad of Montferrat, assuming the title of "King of Jerusalem" in right of his wife. Friedrich attempted to negotiate with the stubborn old pope, but eventually decided to ignore him, and, on 8 September 1227, Friedrich II of Germany sailed from Brindisi for Jerusalem. The treaty he signed with Friedrich resulted in the peaceful restitution of Jerusalem, Nazareth, and Bethlehem to the "Kingdom of Jerusalem", for the first time since 1187, though historians disagree as to the exact territory returned. Friedrich ruled Jerusalem as regent on behalf of his son, Conrad, and signing a truce with the "Saracens".
