The Tomb of Suleyman Shah is the supposed burial place of Suleyman Shah, the grandson of Seljuk Bey. He supposedly drowned in the Euphrates in modern-day Syria and an Ottoman tomb in or near Qal'at Ja'bar has been associated with Suleyman Shah. In accordance with Article 9 of the Treaty of Ankara (1921) signed between France and Turkey, the site of the tomb is sovereign Turkish territory. In 1973, when the area where the tomb was located was flooded by Lake Assad, the reservoir of the Tabqa Dam, the tomb was moved to a new location north of Qal'at Ja'bar.