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Female Sibyl FitzSiward Click to view Sibyl FitzSiward in the family tree

Sibyl was born in Northumbria, England.  Sibyl's father was Biorn Ulfiusson and her mother was Aefflaed of Bernicia.  Her paternal grandfather was Beorn Bearsson; her maternal grandfather was Ealdred of Bernicia. She had a brother named Sigurd (Syward) of.  She died in 1040.

Sibyl's family with Duncan I "The Gracious" MacCrinan

They had four sons and a daughter, named Duncan of, Malcolm III, Maelmuire or Melkofr of Atholl, Donald III Bane of and Daughter of.

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