Castiglion, extremely rare, is from Veneto, probably from the Vicenza area, Castiglione has a very important Sicilian nucleus, but has stocks in the Cosenza and Crotone areas, in the Bari and Neapolitan areas, in the provinces of Rome, Florence and Milan, in Liguria and in Piedmont, Castiglioni it is present throughout the central north an important strain is found in the provinces of Varese and Como, but there may be other strains in the province of Rimini, Verona, Lucca and Genoa. These surnames derive from toponyms such as Castiglione d'Adda (LO), Castiglione d'Asti (AT), Castiglione d'Intelvi (CO), Castiglione Olona (VA), Castiglione Chiavarese (GE), Castiglione Mantovano (MN), etc. In the year 1000, in the Varese area there is among others the noble family, of the Castiglioni family who then boasted the title of Captains of Castiglione Olona and which in the following century were among the noblest families of the Seprio, in 1300 in Casciago (VA) we find the noble and influential Castiglioni family among the most affluent and powerful, in the 1400s there is a Branda Castiglioni Bishop of Como, and one of his namesake Bishop of Piacenza, created Cardinal in 1411 from the antipope John XXIII, in Berbenno, Valtellina, in 1450 the archpriest Guidotto Castiglioni is at the head of the parish church, Guicciardini in his Memorie cites, referring to noble Florentine knights of 1400: "... Messer Luigi Ridolfi, Messer Matteo Castiglioni, Niccolò da Uzzano ...", in Elice (PE ) in 1500 the Castiglion family i di Penne is among the rich landowners: "... Instruction of ratification of a sale of feudal land in the district of the Sanarci for the benefit of the University of Elce with the renunciation of the pact redeeming, against D. Francescantonio and D. Pompeo Castiglioni heirs of the quondam Camillo Castiglioni ... ", in 1700 the Castiglioni are Marchesi a Calcio (BG).
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