who is the father of the constitution?

The father of the Constitution is James Madison. He played a pivotal role in drafting and promoting the Constitution of the United States, including creating the Virginia Plan which formed the basis of the Constitutional Convention's deliberations. Madison also co-authored the Federalist Papers, which argued for the ratification of the Constitution, and he helped draft the Bill of Rights. Although he modestly credited many others for the Constitution's creation, his contributions earned him the nickname "Father of the Constitution." He was also the fourth president of the United States, serving from 1809 to 1817.