Question: When was Gaston, Prince Of Viana's mother born?
Sentence (from "Gaston I, Count of Foix"): Gaston I of Foix or Gaston VIII of Foix-Béarn( 1287 – Maubuisson, 13 December 1315) was the 9th Count of Foix, the 22nd Viscount of Béarn and Co- Prince of Andorra.
Relevant evidence: No