Question: Jonkheer Douwe Sirtema van Grovestins (Leeuwarden, Brussels, 1710 – February 26, 1778) was a Frisian courtier at the court of which stadtholder, that was the first hereditary Stadtholder of all the United Provinces?
Sentence (from "Douwe Sirtema van Grovestins"): He was first Chamberlain, later Equerry to the stadtholder, and equerry to the Princess after her husband's death.
Relevant evidence: No