The Bulgarian St. Stephen Church (; ), also known as the Bulgarian Iron Church, is a Bulgarian Orthodox church in Balat, Istanbul, Turkey. It is famous for being made of prefabricated cast iron elements in the Neo-Byzantine style. The church belongs to the Bulgarian Christian minority in the city. History The Bulgarian Orthodox Christians of the Ottoman Empire used to pray at the churches of the Phanar Orthodox Patriarchate, as they were part of the Rum Millet—that is, the Orthodox Christian community of the Ottoman Empire—but the Bulgarian nationalist movement of the 19th century advocated the creation of a separate Bulgarian ecclesiastical organization for Bulgarian Orthodox Christians, as they considered the Phanar Patriarchate a predominantly Greek Orthodox institution. These efforts culminated in the recognition of the Bulgarian Exarchate through a firman issued by the Ottoman sultan Abdülaziz in 1870. The richly ornamented church is a three-domed cross-shaped basilica. The altar faces the Golden Horn and a 40 m-high belfry, the six bells of which were cast in Yaroslavl, rises above the narthex. Initially, a small wooden church was erected on the shore of the Golden Horn between Balat and Fener squares (near Eyüp District), where the current church is located. A house was donated by the statesman Stefan Bogoridi, and it was reorganized as a wooden church. It was inaugurated on 9 October 1849 and became an important site of the Bulgarian National Revival. The Ottoman royal decree of 28 February 1870 establishing the Bulgarian Exarchate was first read in the church. After the original wooden structure suffered from a fire, the larger current building was constructed at its place. An iron frame was preferred to concrete reinforcement because of the weak ground conditions. The construction plans were prepared by the Istanbul-based Ottoman Armenian architect Hovsep Aznavur. An international competition was conducted to produce the prefabricated cast iron parts of the church, won by an Austrian company, R. Ph. Waagner. The prefabricated elements, weighing 500 tons, were produced in Vienna in 1893 to 1896 and transported to Istanbul by ship through the Danube and the Black Sea. After one-and-a-half years, the church was completed in 1898 and inaugurated by Exarch Joseph on 8 September that year. The main skeleton of the church was made of steel and covered by metal boards. All the pieces were attached together with nuts, bolts, rivets or welding. In terms of architectural style, the church