Jean Ier Du Juch 
Jean Ier was born about 1270. Jean Ier's father was Hervé III Du Juch and his mother was Mahotte De Rosmadec. His paternal grandparents were Hervé II Du Juch and Havoïse De Pont-Croix; his maternal grandfather was Guiomar De Rosmadec. He was an only child. He died in 1312.
He had a biological son named Guillaume Ier.
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