Demarchos or Demarchus () has historically been a Greek civic office.
It can also refer to people of that name. These include: In Greek mythology, a son of Aegyptus, murdered by Eubule, one of the Danaïdes. An epic poet in an inscription in Ptolemais Demarchos, the son of Taron, a Lycian honoured by the Samians for his intercession on their behalf with Demetrios Poliorketes Demarchos, the son of Epidokos, a Syracusan general and opponent of the tyrant Dionysius I Satrap of Hellespontine Phrygia under Alexander the Great, successor of Calas
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