Willem Frederik (1613-64); Count of Nassau-Dietz; Stadholder of Friesland; Portrait of Willem Frederik (1613-64); Stadholder of Friesland. Half-length; standing in armor; to the right; in front of a rock party. A command staff in the right hand; looking at the viewer. To an original by Adriaen Hanneman. Part of the collection of portrait miniatures; Friesland; Willem Frederik; anonymous; Holland; c. 1665; gold (metal); h 10.8 cm x w 8.7 cm x d 0.7 cm