Madison versus Marbury
Nonetheless, the Court stopped short of compelling Madison (by writ of mandamus) to hand over Marbury’s commission, instead holding that the provision of the Judiciary Act of 1789 that enabled Marbury to bring his claim to the Supreme Court was itself unconstitutional, since it purported to extend the Court’s original jurisdiction beyond that which Article III established. The petition was therefore denied.
Right you are. One of the most important of all Supreme Court decisions. Everyone concerned with constitutional law should read it.