1. King Carlo di Borbone, King of Naples and Sicily (ruled 1731-1759)
2. King Ferdinando I of the Two Sicilies (1759-1825)
3. King Francesco I of the Two Sicilies (1825-1830)
4. King Ferdinando II of the Two Sicilies (1830-1859)
5. King Francesco II of the Two Sicilies (1859-1894)
6. Prince Alfonso, Count of Caserta, later Duke of Castro (1894-1931)
7. Prince Ferdinando Pio, Duke of Castro (1931-1960)
8. Prince Ranieri, Duke of Castro (1960-1966)
9. HRH Prince Ferdinando of Bourbon Two Sicilies, Duke of Castro (1966-2008)
10. HRH Prince Carlo of of Bourbon Two Sicilies Duke of Castro (from 2008)