Duchy of Westphalia

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Duchy of Westphalia Herzogtum Westfalen (German)
1102–1803
Coat of arms
The Duchy of Westphalia and other western German states c. 1645
Status	Subordinate to Electorate of Cologne State of the Holy Roman Empire
Capital	Arnsberg
Government	Feudal monarchy
Historical era	Middle Ages
• Established	1102
• Annexed by Hesse-Darmstadt	1803
Preceded by Succeeded by Duchy of Saxony County of Lippe Landgraviate of Hesse-Darmstadt

The Duchy of Westphalia (German: Herzogtum Westfalen) was a historic territory in the Holy Roman Empire, which existed from 1102 to 1803. It was located in the greater region of Westphalia, originally one of the three main regions in the German stem duchy of Saxony and today part of the state of North Rhine-Westphalia. The duchy was held by the archbishop-electors of Cologne until its secularization in 1803.