At the end of a corridor passing the türbe of Battal Gazi there is a mosque. Gıyaseddin Keyhüsrev had the mosque built in 1207-1208. It was restored in the time of Bayezid.

When the Ottomans reshaped the mosque in 1511, they replaced the wooden ceiling by a dome (amongst other changes).
On the picture: The marble minber. Ottoman, early 16th century as well.

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