Prince Philip of Naples and Sicily, Duke of Calabria, Infante of Spain (13 June 1747 – 19 September 1777). At his birth he was the eldest son of King Carlo of Naples and Sicily and was the heir to the throne but never succeeded. His younger brothers, Charles IV of Spain and Ferdinand I of the Two Sicilies replaced him in the succession. When his father became King of Spain in 1759, Philip remained in Naples where he lived until his death from smallpox at the age of thirty. He was given the title of Duke of Calabria as heir to the throne.