Gregorio II Boncompagni

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Don Gregorio II Boncompagni (7 July 1642 – 1 January 1707) was an Italian nobleman, 5th Duke of Sora, Aquino, Arce and Arpino and 6th Marquess of Vignola and Prince Consort of Piombino, Marquis of Populonia, Prince of Venosa and Count of Conza, Lord di Scarlino, Populonia, Vignale, Abbadia del Fango, Suvereto, Buriano, Cerboli e Palmaiolan, and Lord prince of the Tuscan Archipelago including the islands of Elba, Montecristo, Pianosa, Gorgona, Capraia, and Isola del Giglio. He was the great-great-grandson of Pope Gregory XIII.