The Grand Duke of Finland, alternatively the Grand Prince of Finland, was a title used by most Swedish monarchs from 1580 to 1720. The title was first adopted by King Johan III of Sweden, who had been the duke of Finland in 1556–1563.
The Grand Duke of Finland, alternatively the Grand Prince of Finland, was a title used by most Swedish monarchs from 1580 to 1720. The title was first adopted by King Johan III of Sweden, who had been the duke of Finland in 1556–1563.
Source: Wikipedia "Grand Duke of Finland" · CC BY-SA 4.0
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