Question: Who is Jacques De Châtillon's paternal grandmother?
Sentence (from "Guy III, Count of Saint-Pol"): On January 16, 1255, he married Matilda of Brabant, Countess of Artois, daughter of Henry II, Duke of Brabant and Marie of Hohenstaufen, and thereafter was a supporter of his brother-in-law Henry III against Guelders.
Relevant evidence: No