Osman I. or Osman Bay (full form: Abū al-mulūk al-Sulṭān al-ghāzī Fakhr al-Dīn QaraʻUthmān Khān al-awwal bin Ertuğrul bin Sulaymān Shāh al-qayawi al-Turkumānī), was the leader of the Kayı Turkic clan, one of the border governors for the Sultanate of Rûm, and the founder of the Ottoman dynasty that ruled over the Balkans, Anatolia, the Levant, and North Africa for 600 years until it expired with the establishment of the Turkish Republic in 1922.