What was the noble family that XXX was from?
Prince Xavier of Bourbon-Parma
Xavier, Duke of Parma and Piacenza, known before 1974 as Prince Xavier of Bourbon-Parma (called Francisco Javier de Borbón Parma y de Braganza in Spain; 25 May 1889 -- 7 May 1977) was the head of the ducal House of Bourbon-Parma, pretender to the defunct throne of Parma, and Carlist claimant to the royal throne of Spain under the name (Francisco) Javier I.
House of Bourbon-Parma