Helsinki

Helsinki was founded as the trading city of Helsingforst by King Gustav I of Sweden on 12th June 1550.

An excerpt from the article 31 facts about Helsinki

It was intended to rival the Hanseatic city of Rewal on the southern coast of the Gulf of Finland, now known as Tallinn. As a wooden city, Helsinki was plagued by frequent fires in the second half of the 17th century. It had little significance, with a population of about 1700 at the time. The city’s position began to change in the 18th century when it was provided with greater maritime defense.