Question: What is the place of birth of Constance Of Castile, Duchess Of Lancaster's husband?
Sentence (from "Constance of Castile, Duchess of Lancaster"): Constance was married, at Roquefort, near Bordeaux, Guienne, on 21 September 1371, to John of Gaunt, 1st Duke of Lancaster, who was the third son of Edward III of England and Philippa of Hainault, as his second wife.
Relevant evidence: Yes