Question: Who is Joan Of Valois, Duchess Of Alençon's maternal grandmother?
Sentence (from "Joan of Valois, Duchess of Alençon"): Joan of Valois (13 September 1409, in Blois – 19 May 1432, in Angers) was the only surviving child of Charles, Duke of Orléans, and Isabella of Valois.
Relevant evidence: Yes