After a happy reign he died April 3, 1473, leaving his possessions to his son.
A year later Costanzo Sforza married Camilla Marzana d'Aragona, a beautiful and spirituelle princess of the royal house of Naples.

He himself was brilliant and liberal.

He died in 1483, when only thirty-six, leaving no legitimate heirs, his sons Giovanni and Galeazzo being natural children.

His widow Camilla thenceforth conducted the government of Pesaro for herself and her stepson Giovanni until November, 1489, when she compelled him to assume entire control of it.
Such was the history of the Sforza family of Pesaro, into which Lucretia now entered as the wife of this same Giovanni.
The domain of the Sforza at that time embraced the city of Pesaro and a number of smaller possessions, called castles or villas; for example, S.
Angelo in Lizzola, Candelara, Montebaroccio, Tomba di Pesaro, Montelabbate, Gradara, Monte S.Maria, Novilara, Fiorenzuola, Castel di Mezzo, Ginestreto, Gabicce, Monteciccardo, and Monte Gaudio.

In addition, Fossombrone was taken by the Sforzas from the Malatesta.
The principality belonged, as we have seen, for a long time to the Church, then to the Malatesta, and later to the Sforza, who, under the title of vicars, held it as a hereditary fief, paying the Church annually seven hundred and fifty gold ducats.