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Montelongo appears to have disappeared from a surname in Italy, it should derive from a toponym, probably from Montelongo in the province of Campobasso, traces of this surname in the 13th century with the prelate, Suddiacono and Notary Gregorio da Montelongo, Papal Apostolic Legate for Lombardy, which was also Patriarch of Aquileia from 1251 to 1268.
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