King John I, also known as John Lackland, was the King of England from 1199 to 1216. He was the youngest son of King Henry II and Eleanor of Aquitaine. John's reign is often remembered for his conflicts with the nobility and his loss of territories in France, which weakened his power. One of the most significant events during his rule was the signing of the Magna Carta in 1215. This document limited the king's authority and established certain legal rights for the nobility, laying the groundwork for modern democracy. John's failure to uphold the Magna Carta led to further conflicts and his eventual downfall.