The mosque was re-shaped by the Ottomans in 1511; they replaced the wooden ceiling by a dome (amongst other architectural changes). The mihrab and the minber too were renewed.

Mihrab = a semicircular niche in the wall of a mosque that indicates the direction of the Kaaba in Mecca and hence the direction that Muslims should face when praying. The wall in which a mihrab appears is the "qibla wall."
Minber = a pulpit in the mosque where the imam (prayer leader) stands to deliver sermons.

Correspondent: J.M.Criel, Antwerpen.
Sources: Leaflet of the Seyitgazi Külliyesi (1995) & Personal visits (1995 – 1996).