Castori, quite rare, has a Romagna stock, one in Perugia, one in Rome and one in Nuoro, Castoro, which is sporadically in the south, has a consistent stock in the Bari area, especially in Altamura, Grumo Appula and Toritto, should derive from the Latin name Castorus or Castorius, in turn derived from the Greek name Kastor (beaver), one of the Argonauts, the very famous pair of twins Castor and Pollux, immortalized in the constellation of Gemini.
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