Visc. Joscelin I of Porhoet 
Joscelin I of Porhoet's father was Visc. Guithenoc of Porhoet. He was an only child. He died in 1074.General Notes
pg 82, "The Plantagenet Ancestry" by 1928 by W. H. Turton, published 1928
He had a biological son named Eudes I of Porhoet.
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