Question: Who is the maternal grandfather of Blanche Of Navarre, Duchess Of Brittany?
Sentence (from "Agnes of Beaujeu"): Agnes of Beaujeu ("Agnès de Beaujeu"; ? – 11 July 1231) was a French noblewoman, the daughter of Guichard IV of Beaujeu and his wife Sybil of Hainaut.
Relevant evidence: Yes