"A monstrous injurer of heaven and earth," as Shakespeare referred to this powerful medieval matriarch, Eleanor of Aquitaine's reign as England's stormiest and most ambitious queen has never been matched. As the greatest heiress in Europe, she was in turn Queen of France and Queen of England; among her sons were Richard the Lionheart and King John. A magnificent independent ruler in her own right, she lost her power when she married Louis VII of France. She received neither influence nor fame by her second marriage to King Henry II, who jailed her for fifteen years for conspiring and supporting their son's claim to the throne. Her husband was succeeded by their son, King Richard the Lionheart, who immediately released his mother from prison. Eleanor then acted as Regent while Richard launched the Third Crusade. Her loveliness and glamour, her throwing-off of the constraints that shackled women of the twelfth century, and her very real gifts as a politician and ruler make Eleanor's story one of the most colorful of the High Middle Ages.