is the predominant religion in Armenia. The 5th-century Saint Paul and Peter Church demolished in November 1930 by the Soviets, was among the earliest churches ever built in Erebuni-Yerevan. Many of the ancient Armenian and medieval churches of the city were destroyed by the Soviets in the 1930s during the Great Purge. The regulating body of the Armenian Church in Yerevan is the Araratian Pontifical Diocese, with the Surp Sarkis Cathedral being the seat of the diocese. It is the largest diocese of the Armenian Church and one of the oldest dioceses in the world, covering the city of Yerevan and the Ararat Province of Armenia. Yerevan is currently home to the largest Armenian church in the world, the Cathedral of Saint Gregory the Illuminator. It was consecrated in 2001, during the 1700th anniversary of the establishment of the Armenian Church and the adoption of Christianity as the national religion in Armenia. As of 2017, Yerevan has 17 active Armenian churches as well as four chapels. Russian Orthodox Church After the capture of Yerevan by the Russians as a result of the Russo-Persian War of 1826–28, many Russian Orthodox churches were built in the city under the orders of the Russian commander General Ivan Paskevich. The Saint Nikolai Cathedral opened during the second half of the 19th century, was the largest Russian church in the city. The Church of the Intercession of the Holy Mother of God was opened in 1916 in Kanaker-Zeytun. However, most of the churches were either closed or demolished by the Soviets during the 1930s. The Saint Nikolai Cathedral was entirely destroyed in 1931, while the Church of the Intercession of the Holy Mother of God was closed and converted first into a warehouse and later into a club for the military personnel. Religious services resumed in the church in 1991, and in 2004 a cupola and a belfry were added to the building. In 2010, the groundbreaking ceremony of the new Holy Cross Russian Orthodox church took place with the presence of Patriarch Kirill I of Moscow. The church was eventually consecrated on 7 October 2017, with the presence of Catholicos Karekin II, Russian bishops and the church benefactor Ara Abramyan. Other religions According to Ivan Chopin, there were eight mosques in Yerevan in the middle of the 19th century. The 18th-century Blue Mosque of Yerevan was restored and reopened in the 1990s, with Iranian