Duke of Finland

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.

Starting with John III in the 1580s, Swedish monarchs adopted the style of Grand Duke of Finland. This title was used until 1720, revived in 1802–1805, and later adopted by the Russian emperors during the period of the Grand Duchy of Finland (1809–1917).

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