And we have a whole series of videos on that, and all of the factors that led to it. But as we get to the time of this map, one of the things that the High Middle Ages is most known for, the Great Schism, or the East-West Schism, is one of them, the schism between what eventually becomes the Roman Catholic Church and the Eastern Orthodox Church. But what the High Middle Ages are also known for are the Crusades. As already mentioned, you see how the Seljuk Turks are able to take much of Anatolia, much of the peninsula, from the Byzantine Empire. And the West decides to send what will eventually be called Crusaders to help regain land from the Muslims. And so that's where you see the Crusades beginning in 1096 at the very end of the 11th century. You can see the multiple Crusades that occur over roughly the next 200 years.