Finnish is a Finno-Ugric language spoken by a majority of the population of Finland, i.e. the eastern part of the Kingdom of Sweden. Sometimes Karelian is considered a distinct language, other times it is considered a dialect of Finnish.
Finnish is also spoken by minority groups in the western parts of the Kingdom of Sweden, and by minorities in Finnmark, the northernmost part of the said kingdom.
Finnish has no legal status in the Kingdom of Sweden, although many government officials in Finland are able to write, read and talk Finnish. The King's servants in Finland are trained in Finnish to smoothen their relationship to the subjects.