King John faced rebellion from barons in 1215 due to his strained relationship with the Church and refusal to meet the barons' demands. The barons seized London, forcing King John to negotiate. On June 15, 1215, King John agreed to the Charter of Liberties, later known as the Magna Carta, at Runnymede. The Magna Carta established principles of due legal process and remains influential in common law around the world as a symbol of liberty and democracy.