Question: When was Margravine Hedwig Sophie Of Brandenburg's husband born?
Sentence (from "William VI, Landgrave of Hesse-Kassel"): William VI, Landgrave of Hesse-Kassel (23 May 1629 – 16 July 1663), known as William the Just, was Landgrave of Hesse-Kassel from 1637 to 1663.
Relevant evidence: Yes