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Male Jean I Count von Flandern Click to view Jean I Count von Flandern in the family tree

Jean I Count was born on May 1st, 1218 in Etraeungt, Nord, France.1   Jean I Count's father was Burchard Seigneur von Avesnes and his mother was Margaret Countess von Holland.  His paternal grandparents were Jacques Seigneur von Avesnes and Adelfia De Guise; his maternal grandparents were Baldwin IX von Flandern Count von Flandern and Marie von Champagne. He had a half-brother named Guy II "De Dampierre" Count.  He died at the age of 38 on December 24th, 1256.1 

Family Details of Jean I Count's family with Adelaide Countess von Holland

1 World Family Tree Vol. 9, Ed. 1 @ Tree #0120

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