Question: Who is the mother-in-law of Margaret, Countess Of Anjou?
Sentence (from "Margaret, Countess of Anjou"): Margaret, Countess of Anjou (1272 – 31 December 1299) was Countess of Anjou and Maine in her own right and Countess of Valois, Alençon, Chartres and Perche by marriage.
Relevant evidence: No