The present Tomb of Osman Gazi (1258-1326) was built by Sultan Abdülaziz in 1863. It has an octagonal ground plan, with an interior measuring 10 m in diameter.
The large cenotaph sarcophagus is covered with velvet, embroidered in silver thread; an epitaph of two lines gives (in Ottoman Arabic script) the dates of birth, reign and death of the ruler. It is surrounded by a grid, which is inlaid with mother-of-pearl.
The other smaller sarcophagi belong to Alaeddin Paşa (the other son of Osman I, and thus brother of Sultan Orhan), to Asporça Hatun (second wife of Orhan, and a daughter of the Byzantine Emperor Andronikos III) and 15 other relatives of Osman Gazi.

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Bursa – Turquie’ – booklet of the Bursa Müzeleri, 1980 ; Wikipedia ;
‘Vakıf Abideler ve eski Eserler (volume III)’ - Vakıflar Genel Müdürlüğü, Ankara 1983
& ‘Bursa, the Living Museum’ – Ismail Cengiz, 2009.