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|Province of Hesse-Nassau|
|Province of Prussia|
|Kingdom of Prussia, within the German Empire|
|•||1905||15,699.3 km2 (6,062 sq mi)|
|•||1939||16,845 km2 (6,504 sq mi)|
|Density||131.9 /km2 (341.5 /sq mi)|
|Density||159.6 /km2 (413.4 /sq mi)|
|Today part of||Germany|
Hesse-Nassau was created as a consequence of the Austro-Prussian War of 1866 by combining the previously independent Hesse-Kassel (or Hesse-Cassel), the Duchy of Nassau, the Free City of Frankfurt, areas gained from the Kingdom of Bavaria, and areas gained from the Grand Duchy of Hesse (including part of the former Landgraviate of Hesse-Homburg from Hesse-Darmstadt; ). These regions were combined to form the province Hesse-Nassau in 1868 with its capital in Kassel and redivided into two administrative regions: Kassel and Wiesbaden. The largest part of the province surrounded the province of Upper Hesse in the People's State of Hesse.
On 1 April 1929, the Free State of Waldeck became a part of Hesse-Nassau after a popular vote and became part of the Kassel administrative region.
In 1935, the Nazi government abolished (de facto) all states, so the provinces held little meaning. In 1944, Hesse-Nassau was split into the provinces of Kurhessen (capital in Kassel) and Nassau (capital in Wiesbaden). In 1945, after the end of World War II, these two provinces were merged and combined with the neighbouring Hesse-Darmstadt to form the northern and western part of the newly founded state of Hesse. Parts of Nassau were also moved into the Rhineland-Palatinate.
The Oberpräsident (or "High Commissioner") was the chief administrator of a Prussian province, appointed by the King on the advice of the Prussian Minister for the Interior. The Oberpräsident administered the province with the assistance of a Prussian government-appointed provincial council.
- 1867–1871: Eduard von Moeller
- 1872–1875: Ludwig von Bodelschwingh
- 1876–1881: August von Ende
- 1881–1892: Botho zu Eulenburg
- 1892–1898: Eduard von Magdeburg
- 1898–1903: Robert von Zedlitz-Trützschler
- 1903–1907: Ludwig von Windheim
- 1907–1917: Wilhelm Hengstenberg
- 1917–1919: August von Trott zu Solz
- 1919–1930: Rudolf Schwander
- 1930–1932: August Haas (SDP)
- 1932–1933: Ernst von Hülsen
- 1933–1943: Philipp von Hessen (NSDAP)
- 1943–1944: Ernst Beckmann (NSDAP)
The coat of arms is split into three parts, each part showing the coats of arms for the three entities that formed Hesse-Nassau:
- a crowned, silver/red-striped lion on a blue background (Electorate of Hesse)
- a crowned, golden lion on a blue field strewn with billets (Duchy of Nassau)
- a silver eagle with golden talons on a red background (Free City of Frankfurt)