While acting as the Count of Mortain, he married his first wife Isabel, but later annulled the marriage after discovering that they shared the same great-grandfather.  He beca
While acting as the Count of Mortain, he married his first wife Isabel, but later annulled the marriage after discovering that they shared the same great-grandfather.  He became monarch without a wife, but his marriage to Isabella of Angouleme triggered a war with France.  In that war, Arthur of Brittany, who held some claim to this man's throne, was captured, and Anjou and Maine were retaken by (*) Philip II.  Following this king's failure in France, Pope Innocent III excommunicated him for refusing to accept Stephen Langton as the new Archbishop of Canterbury.  Langton supported barons who launched a rebellion in the early 13th century that led to reforms in this man's monarchy.  For 10 points, name this King of England that lost Normandy to the French and signed the Magna Carta.
While acting as the Count of Mortain, he married his first wife Isabel, but later annulled the marriage after discovering that they shared the same great-grandfather.  