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Wez-Velvain is a village in the municipality of Brunehaut, which is located in the Belgian province of Hainaut. The municipality of Brunehaut was created in 1976 by the merging of the former municipalities of Wez-Velvain, Hollain, Laplaigne, Bléharies, Rongy, Lesdain, Howardries, Guignies and Jollain-Merlin.
Wez-Velvain is made of two hamlets named after the Latin word vallis, "a valley", and fel vain, meaning "a fertile plain".
The written form Wez-Velvain existed in 1012 but was later altered as Guiez, Wes-Velvein, Weesh and Velvaing.
In 1302, Wez was sacked by Gossuin d'Antoing after his enemies had been welcomed there by Anselme d'Aigremont. The fortress was besieged by the Burgundians in 1478 and in 1521 by Baron de Ligne on Charles Quint's behalf.
It was later bought by the bishops of Tournai and eventually demolished in 1820.
Wé is a Walloon word meaning « ford ».