Costanza Farnese (19 December 1500 – 23 May 1545) was a daughter of Alessandro Farnese[1] and Silvia Ruffini.[2] Born before her father became Pope Paul III, her siblings were Pier Luigi, Paul, Ranuccio and Lucrezia.
She married Bosio II Sforza,[1] count of Santa Fiora e Cotignola, they had:
- Guido Ascanio[1]
- Alessandro Sforza[1]
- Sforza Sforza,[1] whose children were: Francesco Sforza[1]; Alessandro, 7th count of Santa Fiora, duke of Seni and prince of Valmontone, father of cardinal Federico Sforza.; Costanza Sforza[1]
- Mario (1530–1591), count of S. Fiora, married Fulvia Conti[1]
- Faustina Sforza, married Muzio Sforza of Caravaggio[1]
- Francesca Sforza, married Girolamo Orsini[1]
- Camilla, married Besso Ferrero of Masserano[1]