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Gṛtsamāda (author, or family of authors, of the oldest book in the Rg Veda)
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King Minos (or any real Minoan); Vercingetorix (or Celtillus) otherwise
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Enmebaragesi (first confirmed historical Sumerian king)
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Hattusili I (first historical King of the Hittites)
(5.) Queen Himiko, King Tang of Shang, or King Menes (early or first confirmed historical rulers of Japan, China, and Egypt)