Jean I De AVESNES COUNT OF FLANDERS & HAINAULT & Aleida Countess Of HOLLAND COUNTESS OF AVESNES 
Jean I De and Aleida Countess Of were married in a religious ceremony in September 1246 in Frankfort Am Main, Hessen-Nassau, Prussia. They had six sons and a daughter, named Jean II De, Baudouin de, Bouchard de, Guy de, Guillaume de, Floris de and Jeanne de.
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Personal Details
Jean I De AVESNES COUNT OF FLANDERS & HAINAULT
Jean I De was born in April 1218 in Houffalize, Luxembourg, Belgium. He died at the age of 39 on December 24th, 1257 in Valenciennes, Nord, France. He was buried in Valenciennes, Nord, France.
Aleida Countess Of HOLLAND COUNTESS OF AVESNES
Aleida Countess Of was born about 1226 in Of, 'S-Hertogenbosch, Noord-Brabant, Netherlands. She died in Valenciennes, Nord, France.
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Children
Jean II De AVESNES COUNT OF HOLLAND & HAINAULT
Jean II De was born about 1247 in Brabant, Brabant, Belgium. He died on August 22nd, 1304 in Valenciennes, Nord, France.
Baudouin de AVESNES
Baudouin de was born about 1249 in Of, Valenciennes, Nord, France. He died about 1299.
Bouchard de AVESNES BISHOP OF METZ
Bouchard de was born on May 26th, 1251 in Of, Valenciennes, Nord, France. He died at the age of 45 on November 29th, 1296. He was buried in Metz, Moselle, France.
Guy de AVESNES BISHOP OF UTRECHT
Guy de was born about 1253 in Of, Valenciennes, Nord, France. He died on May 28th, 1317 in Utrecht, Utrecht, Netherlands.
Guillaume de AVESNES BISHOP OF CAMBRAIA
Guillaume de was born in 1254 in Of, Valenciennes, Nord, France. He died at the age of 42 in 1296.
Floris de AVESNES PRINCE OF ACHAJA
Floris de was born in 1255 in Of, Valenciennes, Nord, France. He died at the age of 42 on January 23rd, 1297.
Jeanne de AVESNES ABBESS OF FLINES
Jeanne de was born about 1256 in Of, Valenciennes, Nord, France. She died in 1304.
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