TOME 1

De gules with ten lozenges argent (these lozenges are ancient "tetons", large nails intended to reinforce a wooden shield covered with leather; originally neither joined nor abutted). The origin of the coat of arms comes from the defensive role of Lalaing for the town of Douai. The coat of arms of Lalaing being identical to that of Douai (full gules) but reinforced with ten iron nails, it means Bras-de-Fer and probably refers to Baudouin I of Flanders, since Douai means forearm in Gallo-Roman.
The House of Lalaing is an important familythe of the Belgian nobility (Flanders/Hainaut) to which the Lords of Lalain belongg. From the House of Forest (vassal of the Count of Flanders), originating from Forest-sur-Marque now in France near Lille (former county of Flanders), it gave numerous governors and generals to the service of the sovereigns of Hainaut, dukes of Burgundy and then kings of Spain, seven grand bailiffs of Hainaut, Stadhouders of Holland, Zeeland and Gelderland, and twelve knights of the Order of the Golden Fleece. The present family still lives in Belgium3. Their castle, Château de Lalaing (nl) (also called Hof van Lier), is located in Zandberg.
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Sources :
https://fr.wikipedia.org/wiki/Maison_de_Lalaing
Source gallica.bnf.fr / BnF
