Ertuğrul
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Ertuğrul or Ertuğrul Ghazi was a 13th-century uch bey, who was the father of Osman I. Little is known about Ertuğrul's life. According to Ottoman tradition, he was the son of Suleyman Shah, the leader
Ertuğrul depicted in 17th-century Ottoman miniature book Sübhatü’l-ahbâr
Minted coin, contemporary with Osman I, indicating the existence of Ertuğrul. The coin reads as follows: Struck by Osman, son of Ertuğrul. May his kingdom perpetuate
Grave of Ertuğrul, Söğüt
1616 depiction of Ertuğrul at court, from Tadj al-Tawarikh
Kayı (tribe)
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The Kayı were an Oghuz Turkic ethnic group and a sub-branch of the Bozok tribal federation. In his Dīwān Lughāt al-Turk, the 11th century Kara-Khanid scholar Mahmud al-Kashgari cited Kayı as of one of
Council of Tuman, Köl Erki, Kayı Yavgu Han and Korkut. Jami al-Tawarikh (1426-30), Herat