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The city of Pori (Swedish: Björneborg) is founded by Duke John on the shores of the Gulf of Bothnia.

Duke John founded the city of Pori on the Finnish coast in 1558, expanding Swedish influence in the region.
Duke John of Finland founded the city of Pori on the shores of the Gulf of Bothnia in 1558. Originally named Björneborg in Swedish, the settlement served as a commercial and defensive outpost. The city’s strategic coastal position facilitated trade between Finland and the wider Baltic region. Early settlers established sawmills and shipbuilding operations to harness the nearby forests. Over the centuries, Pori evolved into an important industrial and cultural center in western Finland. Its founding reflects the expansion of Swedish influence during the 16th century.
1558 Pori Swedish Duke John Gulf of Bothnia