He was Known as the "father of the Constitution". He wrote the notes for the Constitution. He had helped develop Virginia's Constitution 11 years earlier, and it was his "Virginia Plan" that served as the basis for debate in the development of the U.S. Constitution. Madison argued strongly for a strong central government that would unify the country.
President of the Convention. His experience in the Revolutionary War had convinced him that excessive concerns for states’ rights and state sovereignty would be fatal to an effective national government. Washington initially refused to attend because he suspected that he would be made the Convention's leader, and probably be proposed as the nation's first chief executive.