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Arciduca, which would seem unique, should be due to a mistaken transcription of the surname Arduca, which is specific to Palmi in the Reggio area, which could derive from a playful nickname, a contracted form of the word archduke, perhaps to emphasize an excessively pompous behavior of the progenitor, but, more probably, it derives from a position of importance occupied by the family, perhaps in which an archdeacon was present.
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