Question: When was Margravine Hedwig Sophie Of Brandenburg's husband born?
Sentence (from "Margravine Hedwig Sophie of Brandenburg"): , Schmalkalden) was Landgravine consort of Hesse-Kassel by marriage to William VI, Landgrave of Hesse-Kassel, and regent from 1663 until 1677 during the minority of her sons, William VII, Landgrave of Hesse-Kassel and Charles I, Landgrave of Hesse-Kassel.
Relevant evidence: Yes