Ertuğrul Bey was a prominent leader of the Kayı tribe, part of the Oghuz Turks. He is best known as the father of Osman I, the founder of the Ottoman Empire. Ertuğrul played a crucial role in the establishment of Turkish presence in Anatolia during the 13th century. Ertuğrul Bey is often celebrated for his bravery and leadership skills. His exploits against the Byzantine Empire and Mongol invasions helped secure a foothold for his people in the region. His legacy continues to be honored in Turkish culture and history.