Question: When did Aldetrude's mother die?
Sentence (from "Waltrude"): Saint Waltrude (died April 9, 688 AD) is the patron saint of Mons, Belgium, where she is known in French as Sainte Waudru, and of Herentals, Belgium, where she is known in Dutch as Sint-Waldetrudis or -Waltrudis.
Relevant evidence: Yes