The influential document signed in 1215, limiting the powers of the English monarch, is the Magna Carta. Signed by King John of England at Runnymede, the Magna Carta was a response to the king's tyrannical rule and heavy taxation. This document established critical legal principles, including the idea that everyone, including the monarch, is subject to the law. It laid the groundwork for the development of constitutional law and individual rights, influencing political thought throughout history, especially in the context of democracy. The Magna Carta's enduring legacy is seen in various legal frameworks and democratic principles worldwide today.