Maria Vittoria dal Pozzo
Maria Vittoria dal Pozzo was an Italian noblewoman and was the Princess della Cisterna in her own right. Married to Amedeo of Savoy, Duke of Aosta, a son of Victor Emmanuel II of Italy, she was later the queen of Spain from 1870 until her husbands abdication in 1873. She is an ancestress of the present Duke of Apulia, a claimant to the throne of Italy.
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Source: Wikipedia