This mosque was built by Ebu İshak during the reign of Yıldırım Bayezıt and renovated during the reign of Fatih Sultan Mehmet in 1479.

It was heavily damaged during the 1855 earthquake, but has been rebuilt to what we see now.

The mosque has an ‘reverse T’ ground plan, which is typical of the larger early-Ottoman mosques. Its north facade has 5 arches opening onto the porch and is 19,8 m wide.
The polygonal structure on the foreground is a ‘şadırvan’, a type of fountain that is usually built in the yard or entrance in front of mosques or other buildings where ritual prayers can be held, with the main purpose of providing water for drinking or ritual ablutions to several people at the same time, but also as decorative visual or sound element. It is a typical element of Ottoman architecture. It is also called ‘abdest alma çeşmesi’ (= fountain for ablutions).

Correspondent: J.M.Criel, Antwerpen.
Sources: ‘Vakıf Abideler ve eski Eserler (volume III)’ - Vakıflar Genel Müdürlüğü, Ankara 1983 & Wikipedia.