Curiously, Vittorio Emanuele, although effective Crown Prince of Italy in May-June 1946, is not known as 'Crown Prince' (as for example Alexander of Yugoslavia/Serbia) but rather as 'Prince of Naples'. Since the title of Prince of Piedmont has historical significance within the Savoy dynasty I've never understood why either Vittorio Emanuele or his only son Emanuele Filiberto didn't or don't carry (or, more accurately, use) this title. In hindsight they appear to have left the door open for an Aosta heir to assume it, which is what has happened, although maybe they were hoping that EF would have a son to carry the Piedmont title.