Kaya Alp (Ottoman Turkish: قایا الپ, lit. 'Brave Rock') was, according to Ottoman tradition, the son of Kızıl Buğa^[1] or Basuk^[2] and the father of Suleyman Shah. He was the grandfather of Ertuğrul Ghazi and great grandfather of the Ottoman Empire founder, Osman I.^[3] He was also famously known for being the successing name of Ertokus Bey’s son Kaya Alp. He was a descendant of the ancestor of his tribe, Kayı son of Gun^{[citation needed]} son of Oghuz Khagan, the legendary progenitor of the Oghuz Turks.

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