They are sacking Constantinople, the capital of the Byzantine, or the Eastern Roman Empire, the most important city in Eastern Christendom. And once they successfully sack the city in bloody fashion, they break up the Byzantine Empire amongst themselves. And you can see how they break it up. So the Fourth Crusade had very little effect on the actual Holy Land, but it does cause a temporary end to the Byzantine Empire. As we get to 1261, Constantinople is retaken by the Byzantines. But once again, this is the beginning of the end of the Byzantine Empire, the fact that for half a century, it was taken over by the West. So you can imagine with Jerusalem still in the hands of the Muslims.