Duke of Finland (Finnish: Suomen herttua; Swedish: hertig av Finland) was an occasional title granted as a tertiogeniture to the relatives of the King of Sweden between the 13th and 17th centuries. It included a duchy along with feudal customs.
Duke of Finland (Finnish: Suomen herttua; Swedish: hertig av Finland) was an occasional title granted as a tertiogeniture to the relatives of the King of Sweden between the 13th and 17th centuries. It included a duchy along with feudal customs.
Source: Wikipedia "Duke of Finland" · CC BY-SA 4.0
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