Mainfred de Percy 
Mainfred was born about 0891. Mainfred's father was Duke Rollo Rognvaldsson and his mother was Duchess Popa de Bayeaux. His paternal grandparents were Ragnvald (The Wise) Eysteinsson and Countess Ragnhild Hrolfsdotter. He had two brothers and four sisters, named Duke William I, Count Robert, Crespina, Kathlin, Adele and Gerletta.
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