They say, hey, we are the real Roman Empire. You have these issues of filoque and other things. And this event in 1054 eventually gets known as the Great Schism or the East-West Schism because it only gets further and further cemented only further and further apart. As you get to the end of the 11th century, the Crusades began. And we'll do more videos detailing the Crusades where the Western kings start sending folks at first on the surface to try to help the Byzantines reconquer land from the Muslim empires. But even when they are successful, they don't give that land back to the Byzantines. They actually set up crusader kingdoms.