Ernest Casimir was Count of Nassau-Dietz and Stadtholder of Friesland, Groningen and Drenthe.
Portrait of Ernest Casimir, Count of Nassau-Dietz
William Frederick, was Count of Nassau-Dietz, Stadtholder of Friesland, Groningen and Drenthe.
Ernest Casimir, Count of Nassau-Dietz
…Henry Casimir I, Count of Nassau-Dietz (21 January 1612 – 13 July 1640) William Frederick, Prince of Nassau-Dietz (7 August 1613 – 31 October 1664), married Albertine Agnes of Nassau Elizabeth (25 July – 18 September 1614…
William Frederick of Nassau-Dietz by Wybrand de Geest, 1632
Diez Castle, Germany
William Frederick, Prince of Nassau-Dietz in later life