The individual known as the "Father of the Constitution" is James Madison. He earned this title for his pivotal role in drafting and promoting the United States Constitution and the Bill of Rights. Madison was instrumental in organizing the Constitutional Convention and authored the Virginia Plan, which served as the basis for the convention's deliberations. Additionally, he was a key figure in writing the Federalist Papers, which were influential in securing the ratification of the Constitution. Despite his title, Madison acknowledged that the Constitution was the work of many individuals. He later served as the fourth President of the United States.