Pandulph is the Cardinal of Milan and a legate of the Pope, sent to enforce obedience from John.
Full of his own authority, he is a sly, hair-splitting politician, and a very persuasive man. In his quest to bring John to heel, he excommunicates the English King and threatens the French monarch with the same sentence if he does not immediately make war on John. He has little sympathy for Constance, whose claims for her son he finds rather a distraction from the main point of John’s disobedience. He tempts Lewis into invading England, and uses this invasion as an argument that persuades John to submit himself to the Pope. Having no more need of the French army, he attempts to call off the attack, but a little too late. When Lewis realizes that his invasion has failed, he uses Pandulph as a go-between to negotiate terms with the English.