Duchy of Bremen
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The Duchy of Bremen was a state of the Holy Roman Empire, with territory stretching from the north of the city of Bremen (although not including the city itself) to the coast of the North Sea.
The duchy was created as a possession of the King of Sweden in 1648 by the Peace of Westphalia, from territory previously held by the Archbishop of Bremen. As a result of the Great Northern War, it was passed to the Electorate of Hanover by the Treaty of Stockholm (1719), under whose rule the duchy remained until the electorate's annexation by Prussia during the Napoleonic Wars.