Prince Maurice, the son of William the Silent and Princess Anna of Saxony, was born at the castle of Dillenburg. He was named after his maternal grandfather, the Elector Maurice of Saxony.
Two very similar pieces by Nachtegaal are illustrated in T.H. Colding, Aspects of Miniature Painting, Copenhagen, 1953, figs. 118-119 and described on pp. 123 and 204.