Final answer:
James Madison was known as the Father of the Constitution. He contributed to its formation and authored The Federalist Papers. He also served as the fourth President of the United States.
Step-by-step explanation:
James Madison was known as the Father of the Constitution. He played a vital role in the formation of the Constitution and authored many of The Federalist Papers. Madison used Montesquieu's idea for separation of powers and added a system of checks and balances to ensure no one branch of government was too powerful. He also helped frame the Bill of Rights and served as the fourth President of the United States.