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Male Fastre d'Avesnes Click to view Fastre d'Avesnes in the family tree

Fastre was born about 1140 in Oisy, Namur, Belgium.  Fastre's father was Wautier I de Oisy and his mother was Ada de Mortagne.  His paternal grandparents were Fastre II De Tournai and Richilde; his maternal grandparents were Evrard I Radulf de Mortagne and Francka. He had four brothers and a sister, named Thierry, Evrard, Gossuin, Nicholas "Plukiel" and Petronille.

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