Sibyl Biornsson 
Sibyl was born about 1009 in Northumbria, England. She was an only child. She died in 1040.1 General Notes
Plantagenet Ancestry has Sibyl daughter of Sigurd, but I think it morelikely she was his sister. The dates just seem entirely incompatiblewith her being born that late.
Sibyl and Duncan I MacCrinan were married in a religious ceremony in 1030. They had a son named Malcolm III Canmore King of.
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Children
Malcolm III Canmore King of Scotland
Malcolm III Canmore King of was born in 1031 in Atholl, Perthshire, Scotland.2 He died at the age of 62 on November 13th, 1093 in Alnwick Castle, Northumbria, England (slain besieging).2
1 Ancestral Roots of Certain American Colonists Who Came to America bef 1760 @ 21
2 The Magna Charta Sureties, 1215 @ 161-8
Further source/citation:
The Plantagenet Ancestry @ 21
2 The Magna Charta Sureties, 1215 @ 161-8
Further source/citation:
The Plantagenet Ancestry @ 21
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