Sigulf FitzForn (de Greystoke) 
Sigulf was born in 1025 in Nunburholme, Yorkshire, England.1 Sigulf's father was King's Thane Forne Sigulfsson and his mother was <Unknown>. His paternal grandparents were Sigulf and <Unknown>. He was an only child.General Notes
Note: Ranulph de Meschines gave the Barony of Greystock to one Lyolf, or Lyulphe, (or Sigulf). [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 254, Greystock, Barons Greystock]
Details of Sigulf's family with <Unknown>
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