Baudouin VI Count Of Flanders …, son of Baudouin V-Viii Count Of Flanders … and Margarethe Of Flanders …, was born in July 1171 and died on July 11, 1205 at the age of 34. He married Marie De Champagne …, daughter of Henri I Count Of Champagne … and Marie Of France …, on January 6, 1185. She was born in 1174 and died on August 9, 1204 at the age of 30.

Margarethe Countess Of Flanders & Hainault …, daughter of Baudouin VI Count Of Flanders … and Marie De Champagne …, was born about 1198 and died on February 10, 1279. She married Bouchard D'avesnes …, son of Jacques D'avesnes Conde Et De Lueuze … and Ameline De Guise …, on July 23, 1212. He was born after 1180 and died on September 7, 1244 in Estroeungt. Margarethe Countess Of Flanders & Hainault … and Bouchard D'avesnes … were divorced.

Jan I D'avesnes Regent Of Hainault …, son of Bouchard D'avesnes … and Margarethe Countess Of Flanders & Hainault …, was born in April 1218 in Houffalize and died on December 24, 1257 in Valenciennes at the age of 39. He married Aleida Of Holland …, daughter of Floris IV Count Of Holland … and Machteld Of Brabant …, in September 1246. She was born in 1224 and died on March 1, 1283 at the age of 59.