Roughly contemporaneous with Hagia Sophia, the Church of Saints Sergius and Bacchus was built around the year 530. Because of its apparent similarity to Hagia Sophia, it was known among the Ottomans as the Little Hagia Sophia. The church was converted into a mosque under the reign of Sultan Bayezid II. The foundation set up to support it included the revenues of a public bath, two commercial buildings, several tens of shops and houses, and four villages. The mosque is part of a complex that includes an enclosed graveyard, a mausoleum, a public bath, a religious school with dervish cells, and an elementary school.