Question: When is Louis, Count Of Vermandois's mother's birthday?
Sentence (from "Ralph I, Count of Vermandois"): Under pressure from Queen consort Eleanor of Aquitaine, Louis allowed him to repudiate his wife Eleanor of Champagne, daughter of Stephen, Count of Blois and Adela of Normandy and sister of the reigning King Stephen of England, in favor of Eleanor of Aquitaine's sister, Petronilla of Aquitaine.
Relevant evidence: No