Career
He was the grand-nephew of Pope Gregory XIII
The Boncompagni-Ludovisi union lasted until the French Revolution and included the development of the Archivio Boncompagni-Ludovisi held by The Vatican. Gregorio and Ippolita had six children:
Hugo (1684–1686) died young
Maria Eleonora (1686–1745), Princess of Piombino, married Antonio 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.
