Little Hagia Sophia, formerly the Church of the Saints Sergius and Bacchus, is a former Eastern Orthodox church dedicated to Saints Sergius and Bacchus in Constantinople, later converted into a mosque under the Ottoman Empire.

This Byzantine building, with a central dome plan, was erected during the 6th century. It is believed to have served as a prototype of sorts for the Hagia Sophia, the largest church within the city, that was built a few decades later.


  • The database entry for Little Hagia Sophia contests the claim that it was a prototype for the Hagia Sophia, due to "vastly different" structural elements that would supposedly be evident on a close inspection and comparison of both buildings.