Who is Madison in the marbury vs madiosn case?

In the landmark case Marbury v. Madison (1803), William Marbury is the individual seeking a writ of mandamus to compel Secretary of State James Madison to deliver his commission as a justice of the peace. Marbury had been appointed by outgoing President John Adams, but his commission was not finalized before Adams left office. The case ultimately established the principle of judicial review, allowing the Supreme Court to declare an act of Congress unconstitutional.