The roots of Suomenlinna Church's historical significance can be traced back to the inception of the Viapori fortification in 1748. Following Sweden's loss of Viapori and the entire region of Finland to Russia in 1809, plans were set in motion to establish a church within the fortified area. Czar Nikolai I entrusted the renowned architect Konstantin Thon, a professor at the St. Petersburg Art Academy, with the task of designing the church. Thon's initial drawings for the church were prepared in 1838, but it wasn't until 1849 that the construction project officially commenced.
Under the guidance of architect Ivan Varnek, the church took shape according to Thon's original vision. This Orthodox church, intended to serve the Russian garrison stationed in the area, reached completion in 1854 and was dedicated to the memory of the esteemed Great Prince Alexander Nevsky.
During the 1800s, the Russian garrison churches possessed a distinctively Russian character, embodying the essence of Orthodox architectural style. The Church of Alexander Nevsky exhibited five distinctive onion-shaped domes, with its design characterized by an abundance of semicircular arches and intricate decorative elements. Inside, the interior was marked by four substantial pillars that provided support for the central dome. The church boasted entrances from three different directions, showcasing a layout that was as practical as it was visually striking. In its time, the Church of Alexander Nevsky was hailed as the most exquisite Orthodox church in Finland, showcasing the pinnacle of architectural artistry.
As part of the larger narrative of Suomenlinna's transformation, the church stands as a testament to the melding of history, culture, and architectural prowess. Its journey from a symbol of Russian presence to a revered architectural masterpiece encapsulates the evolving significance of Suomenlinna Church within the context of Finnish history and cultural heritage.