While wandering in the Art Gallery of Ontario (AGO), I came across this miniature portrait of Magdalena Wilhelmine of Baden-Durlach (1677-1742).  Born a princess of Württemberg, she married a Margrave of Baden-Durlach, for whom she is wearing mourning here.

Magdalena Wilhelmine of Baden-Durlach (1677-1742) in widow’s weeds, ca. 1740.  Miniature watercolour on vellum framed in gilded metal; on display at the Art Gallery of Ontario (AGO).

Having never heard of her, I was intrigued.  A quick search on the English and German Wikipedia revealed that she was the widow of that Margrave of Baden-Durlach, Karl Wilhelm (r. 1709-1738), who founded the eponymous new city of Karlsruhe and built its spectacular Versailles-inspired palace.