Masyas, Masyus or Masyos (Greek: Μάσυος) was a King of the Semnones (Greek: Σεμνόνων βασιλεύς) in the 1st century. The Semnones were a Germanic tribe, part of the Suebi. Cassius Dio writes that he at one point visited Roman emperor Domitian along with the priestess Ganna.

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