In Gallo-Roman religion, Segomo ("victor, mighty one") was a war god worshipped in Gaul. In Roman times he was equated with Mars and Hercules. He may be related to Cocidius, a similar god worshipped in Britain. The name of the legendary High King of Ireland Nia Segamain, which translates as "sister's son or champion of Segamon", may be related.

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