Mahaut married Simon de Lalaing 1310. Simon (son of Nicolas de Lalaing and Agnès de Willerval) was born Abt 1280; died 3 May 1333, Valenciennes (Nord), Pas-de-Calais, France; was buried , Cloître de Beaumont, Valenciennes (Nord), Pas-de-Calais, France. [Group Sheet]