Ippolita Ludovisi

Ippolita I Ludovisi (Cagliari, 24 December 1663 – Rome, 29 December 1733) was the Princess of Piombino, Marchioness of Populonia, Princess of Venosa and Countess of Conza, Lady di Scarlino, Populonia, Vignale, Abbadia del Fango, Suvereto, Buriano, Cerboli e Palmaiolan, and Lady princess of the Tuscan Archipelago including the islands of Elba, Montecristo, Pianosa, Gorgona, Capraia, and Isola del Giglio from 1701 until her death in 1733.

She was the youngest daughter of Niccolò I Ludovisi, Prince of Piombino, etc, nephew of Pope Gregory XV, and third wife Constanza Pamphili, Princess of San Martino and Alviano, sister of Camillo Francesco Maria Pamphili, 1st Prince of San Martino al Cimino and Valmontone, and niece of Pope Innocent X.

In Rome on 19 October 1681 she married Don Gregorio II Boncompagni (Sora, 7 July 1642 – Rome, 1 January/February 1707), 5th Duke of Sora, Aquino, Arce and Arpino and 6th Marquess of Vignola and Prince Consort of Piombino, etc, great-great-grandson of Pope Gregory XIII.

On 27 November 1700, she inherited the family fiefs from her sister Olimpia, including Piombino.

The Principality of Piombino was then inherited by the members of the Boncompagni family, through her eldest daughter Maria Eleonora.