Visc. Geoffroi I of Dinan 
Geoffroi I of Dinan was born about 1006 in Dinan, Bretagne, France. Geoffroi I of Dinan's father was Visc. Bertrand of Dinan. His paternal grandparents were Visc. Hamon of Dinan and Rantlina. He was an only child. Geoffroi I of Dinan is no longer alive.General Notes
pg 173, Burke's " A Genealogical History of the Dormant, Abeyant, Forfeited and Extinct Peerages of the British Empire" published 1883
They had a son named Olivier I of Dinan.
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