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Athena Alkidemos or Alcidemus (defender of the people, demos) was the epithet of Athena, the city-goddess of Pella, Macedonia. A similar Macedonian epithet of Athena was Alcis. Athena Alkidemos with thunderbolt and shield (aegis) was a usual depiction in Hellenistic tetradrachms.
References
Athena Alkidemos Wikipedia(Text) CC BY-SA