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The Duke of Genoa was a subsidiary title of the King of Sardinia. It was first awarded in 1815 to Prince Charles Felix of Savoy future king of Sardinia. In 1831 the title was given to Prince Ferdinando of Savoy, second son of King Charles Albert of Sardinia. The title became extinct on the death of Prince Eugenio, great-grandson of King Charles Albert in 1996.
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Duke of Genoa Wikipedia(Text) CC BY-SA