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Nipsai or Nipsaioi (Greek: Νιψαίοι) is the name of a Thracian tribe. They are mentioned by Herodotus.
References
The Histories (Penguin Classics) by Herodotus, John M. Marincola, and Aubery de Selincourt, ISBN0-14-044908-6, 2003, page 271, "The Thracians of... those who live beyond Apollonia and Mesembria, known as the Scyrmiadae and Nipsaeans, surren- dered without fighting; but the Getae, ..."