Kingdom of the Two Sicilies
For a time the heir to the throne was given the title of "Hereditary Prince of Naples". But this was later changed to the Duke of Calabria after the uniting of the two kingdoms. Collectively the royal family generally lived at the Palace of Caserta. Children of the monarch were born with the style of Royal Highness as well as the title of Prince/ss of the Two Sicilies. Several males in the family were given titles such as "Duke of Castro", "Count of Caserta", "Prince of Salerno", a majority of which were lost due to a lack of male heirs. The present pretending monarch is Infante Carlos, Duke of Calabria, who does use the title of Duke of Calabria.