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Castagnola is typical of the area that includes the Pavese, the Alexandrian, the Piacenza and the Genoese, with an ancient stock also in Naples, of which there are traces at least from the 1500s, Castagnoli, typical of the area that includes Emilia and Romagna and the high Tuscany, Castagnolo is typically Sicilian, of the Messina area, should derive from nicknames based on the term castagnola (small chestnut) or, more probably, from names of homonymous localities, as there are many from the north to the south of our country, as an example we mention Castagnola di Franconalto nell'alessandrino, Castagnola delle Ferriere nel Piacenza and many other similar ones.
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