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. And the Crusaders were trying to reclaim land from the Muslims, and especially the Holy Land, much of which is below the map where you can't quite see it right over here. But it turns out that when they are able to reclaim some of that land, they don't give it back to the Byzantines. They set up what are known as Crusader Kingdoms.