Further down Balat hospital, it is on Çember Street that is connected with the shore. This historical structure, named as Cabir Mosque with the belief that Hazret-i Cabir was buried there, is an old Byzantine churhc that was turned into a mosque in 1490. The construction date of the church is unknown. Some clam that it used to be dedicated to Petrus and Marcus and than it was a curch where Thekla, tha daughter of Emperor Theophilos (829- 842) retreated but none of these have been proved. The building in 1894 earthquake and was left empty until 1906 and continued to function as a mosque after it was renewed.
The central dome of the structure with a closed cross plan that sits on a low tambour has the Turkish architectural style and it was made in the place of the original dome.
Its southeast wall consists of three apses that bulge to outside. In the aspse on the south, there is the post of Cabir bin Abdullah el-Ensari among the sahabas (people who have seen the prophet) of Prophet Muhammed. In 1957, American Byzantine Institute brought to light the frecoes of Kosmas and Damianos among the saints of medicine origin and Prime Angel Micheal from under the paint in the south front of structure. These frecoes are covered with wood.
Address: Çember Street No:4 Avyansaray