Dündar Bey
Dündar Bey was the youngest son of the Kayi Bey Suleyman Shah and a brother of Ertuğrul. He was the uncle of Osman I, the founder of Ottoman Empire.
When his brother Ertuğrul Bey died in 1281, leadership/chief beyship of the Kayı tribe transferred over to Ertuğrul's son, later known as the founder of the Ottoman Empire. When Osman I decided to attack a small Greek island, Dundar rebelled because he thought it would destroy the tribe. The circumstances surrounding his death are, like many other details of his ill documented life; disputed. Historical sources disagree on whether or not he was executed by Osman I.
