Question: When was Beatrice Of Castile, Marchioness Of Montferrat's mother born?
Sentence (from "Violant of Aragon"): Violant or Violante of Aragon, also known as Yolanda of Aragon (8 June 1236 – 1301), was Queen consort of Castile and León from 1252 to 1284 as the wife of King Alfonso X of Castile.
Relevant evidence: Yes