High Quality Content by WIKIPEDIA articles! The Infante Carlos of Spain (29 March 1788 – 10 March 1855) was the second surviving son of King Charles IV of Spain and of his wife, Maria Luisa of Parma. As Carlos V he was the first of the Carlist claimants to the throne of Spain. He is often referred to simply as `Don Carlos`, but should not be confused with Carlos, son of King Philip II of Spain, after whom Verdi`s opera is named.