Question: Who is Magdalene Of Jülich-Cleves-Berg's mother-in-law?
Sentence (from "Magdalene of Jülich-Cleves-Berg"): So, when her brother, Duke John William, died in 1609 without a male heir of his own, both she and William's daughters could play a vital role in the question of who would inherit the important northwest German territory.
Relevant evidence: No