Geoffrey III De Mayenne 
Geoffrey III's father was Geoffrey II De Mayenne and his mother was Gervase De Chateau Gontier. His paternal grandparents were Juhel I De Mayenne and Etienette De Dol; his maternal grandparents were Renaud I De Chateau Gontier and Beatrice De Perche. He was an only child. He died in 1079.
Details of Geoffrey III's family with Hildeburge De Nantes
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Family Systems Theory.
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