Infante Philip, Duke of Calabria

Infante Philip, Duke of Calabria was the eldest son and heir-apparent of Charles III of Spain, but was excluded from the succession to the thrones of Spain and Naples due to his intellectual disability. 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 30.