Reformation

In 1521 the Kalmar Union collapsed and Gustav Vasa became the King of Sweden. During his rule, the Swedish church was reformed (1527). The state administration underwent extensive reforms and development too, giving it a much stronger grip on the life of local communities – and ability to collect higher taxes. Following the policies of the Reformation, in 1551 Mikael Agricola, bishop of Turku, published his translation of the New Testament into the Finnish language. In 1550 Helsinki was founded by Gustav Vasa under the name of Helsingfors, but remained little more than a fishing village for more than two centuries.

King Gustav Vasa died in 1560 and his crown was passed to his three sons in separate turns. King Erik XIV started an era of expansion when the Swedish crown took the city of Tallinn in Estonia under its protection in 1561. The Livonian War was the beginning of a warlike era which lasted for 160 years. In the first phase, Sweden fought for the lordship of Estonia and Latvia against Denmark, Poland and Russia. The common people of Finland suffered because of drafts, high taxes, and abuse by military personnel. This resulted in the Cudgel War of 1596–97, a desperate peasant rebellion, which was suppressed brutally and bloodily. A peace treaty (the Treaty of Teusina) with Russia in 1595 moved the border of Finland further to the east and north, very roughly where the modern border lies.

An important part of the 16th century history of Finland was growth of the area settled by the farming population. The crown encouraged farmers from the province of Savonia to settle the vast wilderness regions in Middle Finland. This was done, and the original Sami population often had to leave. Some of the wilderness settled was traditional hunting and fishing territory of Karelian hunters. During the 1580s, this resulted in a bloody guerrilla warfare between the Finnish settlers and Karelians in some regions, especially in Ostrobothnia.

References: Wikipedia

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