William, the duke of Normandy: 1048 to 1060

Pure insanity. You refused to attend a peace conference hosted by the church: and you thought that attacking your liege lord would be a good alternative? Nothing could be more inimical to your self interest. We won't even try to examine your fate: suffice to say that you will be fortunate if you are not killed or captured; and if neither fate is to be yours, it is highly unlikely that you will keep your duchy intact, having made enemies of all your neighbors. "William the (mad) Bastard" is a worthy epithet for you.