Gregorio II Boncompagni (7 July 1642 – 1 January 1707) was an Italian nobleman and the 5th Duke of Sora. He was the great-grandson of Pope Gregory XIII
Biography He was the eldest son of Ugo, 4th Duke of Sora and Duchess Maria Ruffo di Bagnara.
He married Giustina Gallio (29 October 1644 – 21 July 1679) and then, when she died, he married Ippolita Ludovisi on 19 October 1681.Papal Genealogy: The Families And Descendants Of The Popes by George L. Williams (McFarland, 2004) The Boncompagni-Ludovisi union lasted until the French Revolution and included the development of the Archivio Boncompagni-Ludovisi held by The Vatican.The Vatican Archives: Archivio Boncompagni-Ludovisi
Gregorio and Ippolita had six children: Hugo (1684–1686) died young Maria Eleonora (1686–1745), Princess of Piombino, married her uncle and Gregorio's brother Antonio I Boncompagni Constance (1687–1768), married Vincenzo Giustiniani, Prince of Bassano Maria Teresa (1692–1744), married Urbano Barberini, Prince of Palestrina Giulia (1695–1751), married Marco Ottoboni, Duke of Fiano Anna Maria (1696–1752), married Gian Vincenzo Salviati, Duke of Giuliano
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