The "Duke of Finland" is a historical title that was created in the early 18th century. It was primarily associated with the Swedish monarchy, as Finland was part of the Kingdom of Sweden until 1809. The title was often held by members of the royal family, symbolizing their connection to the region and its governance. In 1809, after the Finnish War, Finland became a Grand Duchy under the Russian Empire, and the title of Duke of Finland became less prominent. Today, the title is largely of historical interest, reflecting the complex relationship between Finland, Sweden, and Russia.