Petronille De Avesnes 
Petronille was born about 1090 in Avesnes, Pas-de-Calais, France. Petronille's father was Fastre I D'Oisy and her mother was Ade De Avesnes. She was an only child.
‌Petronille and Johann I were married in a religious ceremony about 1120. They had a son named Johann II.
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