Prince Xavier, Hereditary Duke of Parma

Xavier, Duke of Parma and Piacenza, known in France before 1974 as Prince Xavier de Bourbon-Parme, known in Spain as Francisco Javier de Borbón-Parma y de Braganza or simply as Don Javier, was head of the ducal House of Bourbon-Parma. He is best known as dynastic leader of Carlism and the Carlist pretender to the throne of Spain, since 1936 as a regent-claimant and since 1952 as a claimant, appearing under the name Javier I. Since 1974, he was pretender to the defunct throne of Parma. He is also recognized as involved in the so-called Sixtus Affair of 1916–1917 and in the so-called Halifax-Chevalier talks of 1940.