King James IV of Scotland was born on March 17, 1473.
King James VI of Scotland became King James I of England
King Wladislaus IV of Poland was born on June 9, 1595.
King Charles IV of Spain was born on November 11, 1748.
King Henry IV of France was born on December 13, 1553.
King Taufa'ahau Tupou IV was born on July 4, 1918.
King Edward IV of England was born on April 28, 1442.
King Philip IV of Spain was born on April 8, 1605.
King Henry IV of England was born on April 3, 1367.
King Louis IV of France was born on September 10, 920.
King Frederick IV of Denmark was born on October 11, 1671.
King Peter IV of Aragon was born on September 5, 1319.