Question: Who is the paternal grandmother of Wala Of Corbie?
Sentence (from "Wala of Corbie"): Wala (c. 755 – 31 August 836) was a son of Bernard, son of Charles Martel, and one of the principal advisers of his cousin Charlemagne, of Charlemagne's son Louis the Pious, and of Louis's son Lothair I.
Relevant evidence: Yes