The Bell Tower of Saint Sophia Cathedral in Kyiv is a monument of Ukrainian architecture in the style of Ukrainian (Cossack) Baroque. It is one of the Ukrainian national symbols and symbols of the city of Kyiv. It was built in 1699–1706 at the expense of Hetman Ivan Mazepa. It was significantly rebuilt in 1744–1748 according to the design of Gottfried Johann Schädel, and in 1851–1852 the fourth tier was added according to the design of the diocesan architect Paul Sparro. The bell tower is vertically dominant in the Upper City or Old Kyiv. It is part of the National Reserve "Sophia of Kyiv."