Question: What is the date of death of Duchess Louise Frederica Of Württemberg's mother?
Sentence (from "Henrietta Maria of Brandenburg-Schwedt"): She was the daughter of Philip William, Margrave of Brandenburg-Schwedt (1669-1711), the eldest son of the elector's second marriage with Sophia Dorothea of Schleswig-Holstein-Sonderburg-Glücksburg.
Relevant evidence: No