Both typical of the Bergamo area, both Avogadri and Avogadro and the Veronese both Avogaro and the very rare Avogari, derive from the medieval Venetian dialect term avogadro or avogaro which served to indicate not only the lawyer, but also the public official with administrative responsibilities; in Brescia already in the 1200s the members of some noble families were called Avogadri which the bishop had entrusted the defense of his possessions also with the use of the weapons. Examples of this surname can be found in Venice in 1400 with a certain Rambaldo Avogaro from Treviso and in 1470 in Bergamo with a Emanuele Avogadro; in 1600 the Avogadro were feudal lords on behalf of the Bishop of Zanano (BS) in Valtrompia. The most famous character was Count Lorenzo Romano Amedeo Carlo Avogadro of Quaregna and Cerreto (VC) (9/8/1776 - 9/7/1856) recalled for his legacy that he states: "equal volumes of different gases for the same pressure and temperature contain the same number of molecules ". information provided by Francesco Avogadro di Valdengo the surname Avogadro is typically from the Vercelli area | Biella where the family settled around 500, was one of the first Christian families and was Advocatores of the Church from which the later surnames De Advocatis and finally Avogadro, who constituted a consortium that came to include 140 fiefs in the areas of Vercelli and Biella.
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