The Devlethan mosque, built in the 14th century, but bearing the name of Devlethan, brother of Kiliç Arslan II (1155-1192). It underwent several restorations since. The façade of the mosque has characteristics of the Period of the Principalities - which, in the case of Yalvaç, is the Beylik of the Hamitoğulları, who had their capital city in Eğirdir (some 65 km to the northwest) and controlled Yalvaç during the period 1280-1380.
On the right side of the picture: the mosque’s ‘şadırvan’.

A Şadırvan (from the Persian ‘Sadirvan’) is 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: Websites of ‘asirproje.com’ and ‘yalvaç.net’ & Wikipedia.