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Beatrice of Montferrat (c.1210 – 1274) was an Italian noblewoman, the eldest daughter of William VI, Marquess of Montferrat, and the third wife of Guigues VI of Viennois, by whom she had two sons.[citation needed] According to the vida of the troubadour Gauseran de Saint-Leidier, Beatrice was the domna (lady), whom he allegedly loved. He celebrated his idealised devotion to her in his cansos.