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In page Boris III of Bulgaria:

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Hitler was convinced that the Italian royal court arranged for the poisoning of Boris III, as he believed that Princess Mafalda of Savoy, sister of Joan of Bulgaria, had visited Bulgaria four weeks before the monarch's death, and that her stay had coincided with the events of 25 July 1943,[12][13] when Italian Fascist dictator Benito Mussolini was removed from power by King Victor Emmanuel III.[citation needed] However, Princess Mafalda "arrived in Bulgaria only after King Boris's death, to attend the funeral",[14] as contemporary newspaper reports and photographs attest, and "Hitler's allegation that she came to Bulgaria before the king's illness is absolutely false and has never been taken seriously."[14]