"The Duchy of Holstein (German: Herzogtum Holstein, Danish: Hertugdømmet Holsten) was the northernmost state of the Holy Roman Empire, located in the present German state of ...
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Schleswig-Holstein. It originated when King Christian I of Denmark had his County of Holstein-Rendsburg elevated to a duchy by Emperor Frederick III in 1474. Members of the Danish House of Oldenburg ruled Holstein – jointly with the Duchy of Schleswig – for its entire existence.
From 1490 to 1523 and again from 1544 to 1773 the Duchy was partitioned between various Oldenburg branches, most notably the dukes of Holstein-Glückstadt (identical with the Kings of Denmark) and Holstein-Gottorp. The Duchy ceased to exist when the Kingdom of Prussia annexed it in 1866 after the Second Schleswig War in 1864." - (en.wikipedia.org 30.01.2020)
- Latitude54.30638885498
- Longitude9.6630563735962
