No one was without a share in the grief. In the alleys, in the streets, in the temples, complaints, weeping, lamentations, grief, the groaning of men, the shrieks of women, wounds, rape, captivity, the separation of those most closely united. Nobles wandered about ignominiously, those of venerable age in tears, the rich in poverty. Thus it was in the streets, on the corners, in the temple, in the dens, for no place remained unassailed or defended the suppliants. All places everywhere were filled full of all kinds of crime. Oh, immortal God, how great the afflictions of the men, bow great the distress!
[From Medieval Sourcebook: Nicetas Choniates: The Sack of Constantinople (1204)]
He eventually embarked on the crusade the following year (1228), which was looked on by the Pope as a provocation, since the church could not take any part in the honor of the crusade, resulting in a second excommunication. By this time the crusading army had dwindled to a meagre force. Knowing that he could not take Jerusalem by force of arms, Frederick negotiated along the lines of a previous agreement he had intended to broker with the Egyptian sultan, Al-Kamil. The treaty resulted in the restitution of Jerusalem, Nazareth, and Bethlehem to the Kingdom, though there are disagreements as to the extent of the territory returned. The Ayyubid ruler of the region, who was nervous about possible war with his relatives who ruled Syria and Mesopotamia, wished to avoid further trouble from the Christians, at least until his domestic rivals were subdued.
[From Frederick II, Holy Roman Emperor - Wikipedia, the free encyclopedia]
With a return to Jerusalem, finally, in 1228. Where is Sir Guillame in the intervening years? Constantinople? Conspiring against the Venetians? Hunting down the Nicene exiles?