Which ruler had the greatest influence on the magna carta?

King John of England had the greatest influence on the Magna Carta, as it was largely a response to his unpopular rule. His heavy taxation, military failures, and conflicts with the nobility led to widespread discontent. In 1215, facing rebellion, he consented to the Magna Carta, which aimed to limit his power and protect the rights of his subjects, particularly the barons. This document laid the foundation for the development of constitutional governance in England.