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. Many in the West are not satisfied. And in 1212, an interesting event may have occurred. There are some accounts of what is known as a Children's Crusade.