Then the Genoese turned their attention to the affairs of their city. In the first year of the fifteenth century they rose to throw off the French yoke. But France was not so easily disposed of. She sent Marshal Boucicault to rule in Genoa; and he built the Castelletto, which was destroyed only a few years ago in our father's time. In 1409, however, Boucicault thought to gain Milan, for Gian Galeazzo Visconti was dead. In his absence the Genoese rose and threw out the French, preferring their own tyrants. These, Adorni, Montaldi, Fregosi, fought together till Tommaso Fregosi, fearing that the others might prove too strong for him, sold the city to Filippo Maria Visconti, tyrant of Milan. So the Visconti came to rule in Genoa. This period, full of the confusion of the petty wars of Italy, while Sforza was plotting for his dukedom and Malatesta was building his Rocca in Rimini; while the Pope was a fugitive, and the kingdom of Naples in a state of anarchy, is famous, so far as Genoa is concerned, for her victory at sea over King Alfonso of Aragon, pretender against Rene of Anjou to the throne of Naples. The Visconti sided with the House of Anjou, and Genoa, in their power for the moment, fought with them; so that Biagio Assereto, in command of the Genoese fleet, not only defeated the Aragonese, but took Alfonso prisoner, together with the King of Navarre and many nobles. That victory, strangely enough, made an end of the rule of the Visconti in Genoa. For, seeing his policy led that way, Filippo Maria Visconti ordered the Genoese to send their illustrious prisoners to Milan, where he made much of them, fearing now rather the French than the Spaniards, since the Genoese had disposed of the latter and so made the French all-powerful. This spoliation, however, enraged the Genoese, who joined the league of Florence and Venice, deserting Milan. At the word of Francesco Spinola they rose, in 1436, killed the Milanese governor outside the Church of S. Siro, and once more declared a Republic. To little purpose, as it proved, for the feuds betwixt the great families continued, so that by 1458 we find Pietro Fregosi, fearing the growing power of the Adorni, and hard pressed by King Alfonso, who never forgave an injury, handing over Genoa to Charles VIII of France.