In 1677, the seaside village of Larvik was established as a kjøpstad (market town). Soon after this, Ulrik Frederik Gyldenløve applied to the King for permission to build a church in the new town. The new church was consecrated on 6 January 1677. The building was constructed as a long church using yellow brick. In 1706, the exterior was covered with a yellow plaster. In 1742, a sacristy was built on the southern end of the building. In 1762, a church porch with a large clock/bell tower was built at the main entrance to the nave.
In 1814, this church served as an election church (valgkirke). Together with more than 300 other parish churches across Norway, it was a polling station for elections to the 1814 Norwegian Constituent Assembly which wrote the Constitution of Norway. This was Norway's first national elections. Each church parish was a constituency that elected people called 'electors' who later met together in each county to elect the representatives for the assembly that was to meet in Eidsvoll later that year.
From 1859 to 1864, the church was rebuilt according to drawings by architect Christian Heinrich Grosch. This included a new neo-Gothic altarpiece and pulpit, new pews, and new second floor seating galleries. The most important change during this renovation was that external buttresses were built into the exterior walls in order to reinforce them. In 1906, the sacristy was enlarged. In the 1970s, the basement under the church was converted into a church hall.
References:Towering 52 meters above the sea, Bengtskär lighthouse is the tallest one in Scandinavia. The building started in in 1905 after the shipwreck of S/S Helsingfors and was completed in 1906. The lighthouse was designed by architect Florentin Granholm. On December a special petrol lantern, designed and built in Paris, was brought to Bengtskär and installed atop the tower.
German fleet bombarded Bengstkär in the First World War in 1914. Since the Gulf of Finland was heavily mined, it was not until 1919 that the surrounding seas were declared safe for shipping, that the light was lit again.
After the war the military value of Bengtskär increased as part of the defence system of independent Finland. In Second World War (1941) Soviet Union made a suprise attack to island. After a bloody battle, the small Finnish garrison emerged victorious. Intermittent repairs to the facility continued during the post-war period.