Kay Kāvus
Kay Kāvus (Persian: کیکاووس; Avestan: 𐬐𐬀𐬎𐬎𐬌 𐬎𐬯𐬀𐬥 Kauui Usan); sometimes Kai-Káús or Kai-Kaus, is a shah in the mythical history of Greater Iran and a character in the Shāhnāmeh. He is the son of Kay Qobād and the father of prince Seyāvash.