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"): Jonkheer Douwe Sirtema van Grovestins (Leeuwarden, Brussels, 1710 – February 26, 1778) was a Frisian courtier at the court of stadtholder William IV, Prince of Orange, and later at the court of his widow Anne, Princess Royal and Princess of Orange.
Relevant evidence: Yes