 He was knighted in 1928 as an Honorary  and in 1934 his daughter Jacqueline Castellani married Sir Miles Lampson.Castellani's enthusiasm for Royal and eminent patients such as Benito Mussolini clouded his reputation and during World War II he supported Italy against the Allies, becoming chief of the Italian Army's medical service.War correspondent Alaric Jacob discovered his looted quarters in Cirene in December 1941 and was tempted to pass his correspondence to his son in law Sir Miles Lampson, then British Ambassador in Egypt.