Ernest Casimir I, Count of Nassau-Dietz
|Ernst Casimir I|
|Count of Nassau-Dietz|
|Spouse(s)||Sophia Hedwig of Brunswick-Lüneburg|
|Noble family||House of Nassau|
|Father||John VI, Count of Nassau-Dillenburg|
|Mother||Countess Elisabeth of Leuchtenberg|
22 December 1573|
|Died||2 June 1632
After the death of his father, the county of Nassau was divided among his five living sons, Ernst Casimir followed him as Count of Nassau-Dietz.
Ernst Casimir was primarily known as an outstanding military leader during the Eighty Years War. He served under Maurice of Nassau, Prince of Orange in the siege of the cities of Steenwijk and Oldenzaal, and Frederick Henry, Prince of Orange during the Siege of Groenlo (1627) and the Siege of 's-Hertogenbosch. As Stadholder of Groningen he founded the Nieuweschans fortress in 1628. Although he owned little in Friesland, he was popular there, and people granted his heir the right to rule after his death.
He was killed by a bullet at the Siege of Roermond while he was inspecting the trenches in June 1632. His son, Hendrik Casimir I succeeded him as count of Nassau-Dietz and as stadholder of Friesland, Groningen and Drenthe.
- stillborn daughter (1608)
- stillborn son (1609)
- unnamed son (1610–1610)
- Hendrik Casimir I of Nassau-Dietz (Arnhem, 1612–1640)
- Willem Frederik of Nassau-Dietz (Arnhem, 1613–1664), married Albertine Agnes of Orange-Nassau.
- Elisabeth (Leeuwarden, 25 July 1614 – Leeuwarden, 18 September 1614)
- Johan Ernst (Arnhem, 29 March 1617 – May 1617)
- Maurice (Groningen, 21 February 1619 – Groningen, 18 September 1628)
- Elisabeth Friso (Leeuwarden, 25 November 1620 – Groningen, 20 September 1628)
Ernest Casimir I, Count of Nassau-DietzBorn: 22 December 1573 Died: 2 June 1632
|Stadtholder of Friesland
Maurice of Nassau
|Stadtholder of Groningen and Drenthe
|New title||Count of Nassau-Dietz
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