Mariefred Charterhouse, sometimes referred to as Gripsholm Charterhouse, was a Carthusian monastery, or charterhouse. It was the only Carthusian monastery in Scandinavia, and one of the last monasteries established in Sweden before the Reformation.
The establishment of a Carthusian monastery in Sweden was brought about by the efforts of Jakob Ulvsson, Archbishop of Uppsala, and Kort Rogge, Bishop of Strängnäs, who in 1493 persuaded Sten Sture the elder, Regent of Sweden, to have the monks Fikke Dyssin and Johannes Sanderi together with two lay brothers sent from the Marienehe Charterhouse near Rostock to Sweden for a meeting with the riksrådet (Privy Council of Sweden). Later that year Sten Sture enfeoffed the Carthusians with the Gripsholm estate in Selebo härad in Södermanland and in 1502 gave them other lands round about.
The monastery was built on the high ground where Mariefred church now stands, built on the charterhouse ruins in the 1620s, close to Gripsholm Castle. The monastery church was dedicated on 15 February 1504.
Mariefred Charterhouse was short-lived: in 1526 it was one of the first monasteries secularised by Gustav Vasa. In December 1525 he claimed its assets from the heirs of Sten Sture the Elder, who had given the estate to the monastery on the condition that it should pass to the right heirs of the monastery if it were ever wound up. This claim was legitimated by the Privy Council in January 1526.
Virtually no trace of the monastic buildings now remains above ground: Gustav Vasa had them dismantled for the construction of Gripsholm Castle. A cellar and a few traces of walls have been discovered to the south of the church. A small collection of stones discovered during excavations in the monastery grounds, is in the current Mariefred church tower.
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.