This small church on Rüütli street has been the spiritual home for generations of Estonian Swedes, an ethnic group that's been present in Tallinn since the Middle Ages. The location had originally been an almshouse for the city's poor, but in 1733 the tsarist government gave it to the Swedish congregation, which been left without its own church since the Great Northern War.
During Soviet times the building was converted into a sports hall and fell into disrepair, but was renovated and reconsecrated in 2002. It now has a congregation of around 200, and continues to hold services in Swedish. In addition to its Baroque altar by Joachim Armbrust and a Baroque pulpit, the church has a unique baptistery created by famed sculptor Christian Ackermann in 1680.
References:Ehrenbreitstein Fortress was built as the backbone of the regional fortification system, Festung Koblenz, by Prussia between 1817 and 1832 and guarded the middle Rhine region, an area that had been invaded by French troops repeatedly before. The fortress was never attacked.
Early fortifications at the site can be dated back to about 1000 BC. At about AD 1000 Ehrenbert erected a castle. The Archbishops of Trier expanded it with a supporting castle Burg Helferstein and guarded the Holy Tunic in it from 1657 to 1794. Successive Archbishops used the castle's strategic importance to barter between contending powers; thus in 1672 at the outset of war between France and Germany the Archbishop refused requests both from the envoys of Louis XIV and from Brandenburg's Ambassador, Christoph Caspar von Blumenthal, to permit the passage of troops across the Rhine.