Duchy of Oldenburg
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The Duchy of Oldenburg, named for its capital, the town of Oldenburg, was a state in the north-west of present-day Germany.
Schloss Oldenburg
Eutin Castle
Oldenburg parliament building (German: Landtag)
Treaty of Tsarskoye Selo
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The Treaty of Tsarskoye Selo also called Mageskiftetraktaten in Danish, was a territorial and dynastic treaty between the Russian Empire and Denmark–Norway. Signed on 1 June 1773, it transferred contr
Christian VII Uniting the Ducal with the Royal Part of Holstein in 1773
