The oldest parts of Kalemegdan Fortress date back to the first century AD, when it served as permanent Roman military camp. The Belgrade fort itself (split into the Lower and Upper towns) and the surrounding area (the Kalemegdan park) are located on the point where the river Sava flows into the Danube, which today means an amazing panorama but once was the main cause of repeated invasion and war over this strategic point. Because of this, Kalemegdan today bears witness to the many centuries of various conquering cultures and arts.
Church of The Holy Mother of God – Ruzica is located near the North-East walls of Kalemegdan Fortress, under the Zindan gate. In the time of Despot Stefan Lazarevic there was an old church of the same name, which was destroyed when the Turks conquered Belgrade in 1521. The building that is now the church was used for gunpowder storage in the XVIII century, and turned into a military church in 1867-1869. It was heavily damaged after World War I and renewed in 1925. The iconostasis was made by Kosta Todorovic, and the icons it bears were painted by monk Rafailo Momčilovic. The wall paintings were made by a Russian artist Andrey Bitsenko.
Church St. Petka is located in the immediate vicinity of the Ruzica Church. It was built next to a “miraculous spring” after 1867. The present chapel was built in 1937 according to project made by the architect Momir Korunovic. Its interior walls and vaults are covered with mosaics made by the artist Djuro Radulovic in 1980-1983.