Ertuğrul Gazi, 1198-1288 (Personal Name)

Söğütʼde Ertuğrul Gazi türbesi, 1959.

Türk meşhurları ansik. (Ertuğrul Bey, Gazi (1198-1288); father of Osman, the founder of the Ottoman dynasty)

İslam Ans. (Ertuğrul Gâzı̂)

Enc. of Islam, New ed. (Ertoghrul)

Büyük Lûgat ve ansik. (Ertuğrul Gazi; Osman's father; 13th cent.)

Enc. Brit. 15th ed. (under Osman I: Ertugrul, father of Osman I, est. principelity in Sögüt)