Geoffroy III De Mayenne 
Geoffroy III's father was Geoffroy II De Mayenne and his mother is Gervase De Chateau Gonti. His maternal grandparents are Renaud I De Chateau Gonti Seigneur and Beatrice Du Perche. He was an only child. He died in 1079. He was buried in 1079.
They had a son named Gautier.
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