Philip of Naples and Sicily, "Duke of Calabria", Infante of Spain 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. Wikipedia
Born: June 13, 1747, Palace of Portici, Portici, Italy
Died: September 19, 1777 (age 30 years), Portici, Italy
Great-grandparents: Louis, Grand Dauphin, Maria Anna Victoria of Bavaria, Augustus II the Strong, and more
Grandparents: Philip V of Spain, Elisabeth Farnese, Maria Josepha of Austria, and more
Parents: Charles III of Spain and Maria Amalia of Saxony
Siblings: Charles IV of Spain