The first lord of Lalaing mentioned by Carpentier in his history of Cambrai and the
Cambrésis, and by M. Maloteau de Villerode, in his genealogy of the main houses of France and the Netherlands, is Simon, sire of Lalaing, who lived in 1136. He was given as his wife Reynette de Mottenghien, daughter of Charles, known as the Mutin, lord of Mottenghien and Molenghien, and Richilde of Azincourt. From this marriage were born GÉRARD, successor to the lordship of Lalaing, and MAHAUT OR MARIE, who married Guillaume déHalnaut, lord of Château-Thierry in the county of Namur, between Sambre-et-Meuse. He lived in 1170

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Sources: https://fr.wikipedia.org/wiki/Maison_de_Lalaing
Source gallica.bnf.fr / BnF