Prince Ferdinand Philippe of Orléans ( 3 September 1810 -- 13 July 1842 ) was the eldest son of Louis Philippe d'Orléans , Duke of Orléans and future King Louis Philippe I. Born in exile in his mother 's native Sicily , he was their heir to the House of Orléans from birth .
Prince Ferdinand Philippe of Orléans , Duke of Orléans ( Ferdinand Philippe Louis Charles Henri Joseph ; 3 September 1810 -- 13 July 1842 ) was the eldest son of Louis Philippe d'Orléans , Duke of Orléans and future King Louis Philippe I. Born in exile in his mother 's native Sicily , he was their heir to the House of Orléans from birth .