Another name for Mette was Mette (Mahaut) DE HEMRICOURT.
Research Notes:
Les premiers Seigneurs Argenteau http://www.surf2000.be/vise/sarolay/historique.htm
Marriage Information:
Mette married Jean DE DONGELBERG Seigneur de Longchamps, son of Henri DE DONGELBERG Vicomte d' Upigny and Agnès D' ELZÉE Dame de Longchamps, on 14 Sep 1402.