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Duchy of Holstein
The
Duchy of Holstein
(, ) was the northernmost state of the
Holy Roman Empire
, located in the present
German
state of
Schleswig-Holstein
. It was established when King
Christian I of Denmark
had his County of
Holstein-Rendsburg
elevated to a
duchy
by Emperor
Frederick III
in 1474. Holstein was ruled jointly with the
Duchy of Schleswig
by members of the Danish
House of Oldenburg
for its entire existence.
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