House of Savoy
Italy voted to abolish its monarchy on 2 June 1946, after which Umberto II became king in pretence. On his death in 1983, he was succeeded by his son Vittorio Emanuele, Prince of Naples. However, due to Vittorio Emanuele marrying Marina, Princess of Naples without his father's permission, his cousin Amedeo, Duke of Aosta argued that Vittorio Emanuele's claim to the throne was invalid and that he was the rightful head of the House of Savoy (see House of Savoy#House of Savoy today for details).