William Frederick, was Count of Nassau-Dietz, Stadtholder of Friesland, Groningen and Drenthe.
William Frederick of Nassau-Dietz by Wybrand de Geest, 1632
Diez Castle, Germany
William Frederick, Prince of Nassau-Dietz in later life
Henry Casimir II of Nassau-Dietz was Stadtholder of Friesland and Groningen from 1664 till 1696.
Henry Casimir II by Lancelot Volders
Henry Casimir II