- Was a Spanish aristocrat, holding the title of 9th Marqués de Castellvell (Marquis of Castellvell).
- He wrote an official biography of Spain's King Juan Carlos de Borbón (published in 1993).
- Wrote in French and Catalan.
- In addition to acting, he was a journalist for Spain's national press agency EFE, as well as magazines Paris-Match and Vogue.
- Former son-in-law of Thomas Scott-Ellis, 8th Baron Howard of Walden, and his wife Margherita van Raalte. His first wife, the Honarable Essylt-Priscilla Scott-Ellis was born on 15 Nov 1916 and died in 1983.
- Father of Juan Alfonso Stephen de Villalonga y Scott-Ellis, 10th Marqués de Castellvell (born on 22 June 1946), married to Michelle, and Carmen Beatrice de Villalonga y Scott-Ellis (born on 6 August1947), married in 1975 to Gregory-John Foster, both from his first marriage, and an adopted son, Fabricio de Villalonga y Stella (born on 8 September 1971), unmarried.
- Member of France's Legion of Honor (1994).
- Spent the first two years of his life in a hospital in Munich, Germany due to a severe illness.
- Son of Salvador de Villalonga y Cárcer, 8th Marqués de Castellvell, and wife María del Carmen Cabeza de Vaca y Carvajal of the Marquesses de Portago, etc.
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