Bertha de Gavre 
Bertha de was born about 1144 in Gavere, Flandre-Orientale, Belgium. Bertha de's father was Bertrand (Rasse IV) Sire de Gavre and her mother was Ida Domnison de Chievres. She was an only child.
They had a son named Eustace III Seigneur de.
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Children
Eustace III Seigneur de Roeux
Eustace III Seigneur de was born about 1164 in Roeux, Pas de Calais, Normandy, France. He died in 1224.
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