The name of the document signed in 1215 that limited the power of the king is the Magna Carta. This foundational legal document was sealed by King John of England at Runnymede, near London. The Magna Carta established the principle that everyone, including the king, is subject to the law, laying the groundwork for modern democracy and constitutional governance. It guaranteed certain legal rights to subjects, including the right to a fair trial and protection from unlawful imprisonment. The Magna Carta has inspired numerous constitutional documents worldwide, symbolizing the struggle for justice and the rule of law throughout history.