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In page Portland Vase:

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Between 1778 and 1780, Sir William Hamilton, British ambassador in Naples, bought the vase from James Byres, a Scottish art dealer, who had acquired it after it was sold by Cornelia Barberini-Colonna, Princess of Palestrina. She had inherited the vase from the Barberini family. Hamilton brought it to England on his next leave, after the death of his first wife, Catherine. In 1784, with the assistance of his niece, Mary, he arranged a private sale of the vase to Margaret Cavendish-Harley, Dowager Duchess of Portland.[1] It was sold at auction in 1786 and passed into the possession of the duchess's son, William Cavendish-Bentinck, 3rd Duke of Portland.[citation needed]