The person known as the "Father of the Constitution" is James Madison. He played a pivotal role in drafting and promoting the Constitution of the United States and the Bill of Rights. Madison's Virginia Plan served as the basis for the Constitutional Convention's deliberations, and he was a key figure in the movement to ratify the Constitution. Along with Alexander Hamilton and John Jay, he co-authored The Federalist Papers to support the new federal government. Despite being called the Father of the Constitution, Madison himself insisted that the document was the work of many contributors. He also served as the fourth president of the United States from 1809 to 1817.