The Solovetsky Monastery () is a fortified monastery located on the Solovetsky Islands in the White Sea in northern Russia. It was one of the largest Christian citadels in northern Russia before it was converted into a Soviet prison and labor camp in 1926 to 1939, and served as a prototype for the camps of the Gulag system. The monastery has experienced several major changes and military sieges. Its most important structures date from the 16th century, when Filip Kolychev was its hegumen (comparable to an abbot). History The Solovetsky Monastery was founded in 1436 by the monk Zosima; however, monks Herman and Savvatiy from the Kirillo-Belozersky Monastery lived on the island from 1429 to 1436, and are considered to be co-founders of the monastery. Zosima later became the first hegumen of the monastery. After Marfa Boretskaya, wife of the posadnik of Novgorod, donated her lands at Kem and Summa to the monastery in 1450, the monastery quickly enlarged its holdings, which was situated strategically on the shores of the White Sea. In the 15th and 16th centuries, the monastery extended its commercial activities, becoming an economic and political center of the White Sea region. This included saltworks (in the 1660s, it owned 54 of them), trapping, fishing, mica works, ironworks, pearl works, among others. Archmandrites of the monastery were appointed by the tsar himself and the patriarch. By the 17th century, the Solovetsky Monastery had about 350 monks, 600–700 servants, artisans and peasants. In the 1650s and 1660s, the monastery was one of the strongholds of the Old Believers of the Raskol (schism) in the Russian Orthodox Church. The Solovetsky Monastery Uprising of 1668–1676 was aimed at Patriarch Nikon's ecclesiastic reform and took on an anti-feudal nature. In 1765, the monastery became stauropegic (from the Greek stauros meaning "cross" and pegio meaning "to affirm"), i.e. it was subordinated directly to the Synod. Together with the Sumskoy and Kemsky stockades, the Solovetsky Monastery served as an important frontier fortress with dozens of cannons and a strong garrison. In the 16th to 17th centuries, the monastery succeeded a number of times in repelling the attacks of the Livonian Order and the Swedes (in 1571, 1582 and 1611). During the Crimean War, the Solovetsky Monastery was attacked by three British ships. After nine hours of shelling on the 6 and 7 July 1854 the vessels left with nothing. Between the 16th and