Question: What is the date of death of Guy Iii, Count Of Saint-Pol's wife?
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: Yes