Ertuğrul Gazi Tomb, located in Söğüt, Bilecik, is a historic site dedicated to Ertuğrul Gazi, the father of Osman Gazi, the founder of the Ottoman Beylik, and a Seljuk Uçbeyi. Originally built as an open grave by Osman Gazi in the late 13th century, it was later converted into a tomb by Mehmed I. The tomb has an hexagonal plan with walls constructed from one row of stone and two rows of brick. It underwent restorations during the reigns of Sultan Mustafa III and Abdülhamid II. Near the tomb, there are also the graves of Halime Hatun, Savcı Bey, and the symbolic grave of Osman Gazi.
