King John I of England, who reigned from 1199 to 1216, is often remembered for his conflicts with the nobility and his failure to maintain the territories in France. He was the son of King Henry II and Eleanor of Aquitaine, and his reign was marked by disputes with powerful barons, leading to widespread dissatisfaction. In 1215, King John was forced to sign the Magna Carta, a document that limited the powers of the monarchy and established certain legal rights for the nobility. This event is considered a foundational moment in the development of constitutional law in England and has had a lasting impact on governance.