Through her those rights were transmitted to the house of La Trimouille which were used later on as a claim upon the kingdom of the Two Sicilies.
The capture of Naples gave the Duke of Valentinois his liberty again; so he left the French army, after he had received fresh assurances on his own account of the king's friendliness, and returned to the siege of Piombino, which he had been forced to interrupt.

During this interval Alexander had been visiting the scenes of his son's conquests, and traversing all the Romagna with Lucrezia, who was now consoled for her husband's death, and had never before enjoyed quite so much favour with His Holiness; so, when she returned to Rome.

She no longer had separate rooms from him.

The result of this recrudescence of affection was the appearance of two pontifical bulls, converting the towns of Nepi and Sermoneta into duchies: one was bestowed on Gian Bargia, an illegitimate child of the pope, who was not the son of either of his mistresses, Rosa Vanozza or Giulia Farnese, the other an Don Roderigo of Aragon, son of Lucrezia and Alfonso: the lands of the Colonna were in appanage to the two duchies.
But Alexander was dreaming of yet another addition to his fortune; this was to came from a marriage between Lucrezia and Don Alfonso d'Este, son of Duke Hercules of Ferrara, in favour of which alliance Louis XII had negotiated.
His Holiness was now having a run of good fortune, and he learned on the same day that Piombino was taken and that Duke Hercules had given the King of France his assent to the marriage.

Both of these pieces of news were good for Alexander, but the one could not compare in importance with the other; and the intimation that Lucrezia was to marry the heir presumptive to the duchy of Ferrara was received with a joy so great that it smacked of the humble beginnings of the Borgian house.