Henry Casimir I of Nassau-Dietz was count of Nassau-Dietz and Stadtholder of Friesland, Groningen and Drenthe. Wikipedia
Born: January 31, 1612, Arnhem, Netherlands
Died: July 13, 1640 (age 28 years), Hulst, Netherlands
Great-grandparents: William I, Count of Nassau-Siegen, Juliana of Stolberg, Frederick II of Denmark, and more