From a site elsewhere I quote: "In 1832 a hospital and a small church is build over the same spot. In 1939 the hospital joins Supr Agop Hospital in Elmadağ and in 1859 the decision to build a new and bigger church is taken. The new church building was financed by Hagop and Boğos Göçeyan brothers, and Agop Köçeoğlu. Tülbentçiyan brothers were to build the Church. During the construction brother Garabet Tülbetnçiyan passes away and its brother, Architect Andon Tülbentçiyan finishes the building. The Church is used by the Armenian [Catholic] Community in Istanbul and in 1979 Pope Jean Paul the second visited the Church. "