Ertugrul Bey was a 13th-century Turkish leader and the father of Osman I, the founder of the Ottoman Empire. He is known for his role in establishing the Kayı tribe in Anatolia, where he fought against the Byzantine Empire and the Mongols. His leadership and military skills helped lay the groundwork for the future expansion of the Ottoman state. Ertugrul Bey is often celebrated in Turkish culture and history, particularly through the popular television series Diriliş: Ertuğrul. This series dramatizes his life and struggles, highlighting themes of honor, bravery, and the fight for justice. His legacy continues to inspire many in Turkey and beyond.