Duke of Holstein-Gottorp
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Holstein-Gottorp is the historiographical name, as well as contemporary shorthand name, for the parts of the duchies of Schleswig and Holstein, also known as Ducal Holstein, that were ruled by the duk
Gottorf Castle, after which the house of Holstein-Gottorp is named
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)