Suleyman Shah
Suleyman Shah (c. 1178–1236) was, according to some but not all Ottoman genealogies, the grandfather of Osman I (d. 1323/4), the founder of the Ottoman Empire. Suleyman Shah is believed to have drowned in the Euphrates river near castle Qal'at Ja'bar in present-day Raqqa Governorate, Syria, and was according to legend buried near that castle, in a tomb.