Count of Flanders, Count of Hainault Jan Avesnes of Holland II & partner 
They had a son named William.
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Personal Details
Count of Flanders, Count of Hainault Jan Avesnes of Holland II
Jan was born in 1246 in Brabant, France.1 He died at the age of 58 on August 22nd, 1304 in Valenciennes, Nord, France.1
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