Böcek Ayazma (Spring-Baptisterium) was used for religious puropses towards the end of the 19th century, It was built in the sixth century. There are in the walls, spolia materials dated back to the Early Byzantium Period
See:
- Böcek Ayazmasi-http://tayproject.org/TAYBizansMar.fm$Retrieve?YerlesmeNo=20072&html=bizansdetaile.html&layout=web
- https://www.gotobursa.com.tr/en/mekan/bocek-ayazma-spring-baptisterium-438/
- Haluk Çetinkaya, Churches of Nicaea, in: Nis and Byzantium 2021, pp. 55 – 76