Now, one thing that I felt when I studied the crusades is it's very confusing how Jerusalem in particular goes back and forth between different parties. And just to get an overview of what actually happened, this timeline might be helpful. Green shows Jerusalem under Muslim control. Red shows it under Christian control. So at the end of the first crusades, it switches hands. The Christians are in control all the way until Salah ad-Din takes it back. Now, the Muslims are in control all the way until you get to the Sixth Crusade, where they're able to take some territory back in even parts of Jerusalem, and especially in the barons' crusades, they're able to take significant territory back.