 The Borromei were, during the later years of the Ambrosian Republic, pro-Francesco Sforza, and housed him in the castle while he besieged Milan in 1450.In 1461 Sforza, now the Duke of Milan, made Filippo Borromeo the "Conte di Peschiera".Peschiera was made a comune in 1863, and, partly distinguish it from Peschiera del Garda and partially to honor the Borromeo Family, it was given the full name "Peschiera Borromeo".