Khayu, or Khaiu, was a predynastic pharaoh of Lower Egypt who is mentioned as the fourth ruler on the Palermo Stone. As there is no other evidence of such a ruler, he may be a mythical king preserved through oral tradition,Helck, Untersuchungen zu Manetho und den ägyptischen Königslisten 1956, Berlin: Akademie-Verlag. Untersuchungen zur Geschichte und Altertumskunde Ägyptens 18 or may even be completely fictitious.O'Mara, Was there an Old Kingdom historiography? Is it datable? 1996, Orientalia 65: 197-208Wilkinson, Toby A. H. (2000). Royal Annals of Ancient Egypt. p.85 New York: Columbia University Press). .

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