John became King of England and gained title and lands in France in 1199, after Richard I's death. During his reign, John lost the Duchy of Normandy to King Phillip of France, when he married the heiress of the Angoulâme family, one of two rival families he was asked to mediate between. This had a damaging effect to the King's prestige, and war with France was consequently renewed. In an attempt to win back the lost areas of France, John increased taxes and created a ruthless government. A baronial rebellion followed and, despite attempts at negotiations, John was forced to sign the Magna Carta which protected the privilages of the barons.