- the Bald, a.d. 823–877, king of France 840–877; as Charles II, emperor of the Holy Roman Empire 875–877.
- 1500–58, king of Spain 1516–56; as Charles V, emperor of the Holy Roman Empire 1519–56.
- 1600–49, king of Great Britain 1625–49 (son of James I).
- 1887–1922, emperor of Austria 1916–18; as Charles IV, king of Hungary 1916–18.
- title as Holy Roman Emperor of CharlemagneSee Charlemagne
- title as king of France of Charles II (Holy Roman Emperor)See Charles II
- title as king of Spain of Charles V (Holy Roman Emperor)See Charles V (def. 2)
- title of Charles Stuart 1600–49, king of England, Scotland, and Ireland (1625–49); son of James I. He ruled for 11 years (1629–40) without parliament, advised by his minister Strafford, until rebellion broke out in Scotland. Conflict with the Long Parliament led to the Civil War and after his defeat at Naseby (1645) he sought refuge with the Scots (1646). He was handed over to the English army under Cromwell (1647) and executed
- 1887–1922, emperor of Austria, and, as Charles IV, king of Hungary (1916–18). The last ruler of the Austro-Hungarian monarchy, he was forced to abdicate at the end of World War I