William, the duke of Normandy: 1048 to 1060
The outcome of this inflexible pride of yours will not become apparent to you until cousin Edward dies, and you try to assert your claim as his heir: there will be no papal approval of your war against a Christian kingdom when you are still an excommunicate. You will be fortunate, if the pope doesn't declare a crusade on YOU. William the (wicked) Bastard is what history will call you.