High Quality Content by WIKIPEDIA articles! Saint Waltrude (French: Waudru, Dutch: Waldetrudis) (d. April 9, c. 688) 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. Both cities boast a large medieval church that bears her name.