芬蘭大公
In 1581, King John III additionally assumed the subsidiary title of "Grand Prince of Finland and Karelia". Karelia was soon dropped from the title and considered part of Finland in an expanded eastern extent. The title became established in Latin renderings, and later in the 19th century also in English, as "Grand Duke of Finland", however using the Finnish ("ruhtinas") and Swedish ("furst"), for a crowned or sovereign prince, in its local renderings.