Sibyl Sywardsdottir , of Northumbria 
Sibyl was born about 1014 in Northumbria, England. Sibyl's father was Sigurd (Syward) Biornsson , Jarl of Northumbria and her mother was Aelflaed of Northumbria. She had a brother named Waltheof II Earl of Huntingdon &. She was the older of the two children. She died in 1040.General Notes
Plantagenet Ancestry has Sibyl daughter of Sigurd, but I think it more likely she was his sister. The dates just seem entirely incompatible with her being born that late.
Sibyl and Duncan I MacCrinan King of were married in a religious ceremony in 1030. They had four sons and a daughter, named Malcolm III Canmore King of, Donald III Bane King of, Duncan Mormaer of, Mael Muire (Melmar) Mormaer of and Beatrix 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. He died at the age of 62 on November 13th, 1093 in Alnwick Castle, Northumbria, England (slain besieging).
Donald III Bane King of Scotland
Donald III Bane King of was born about 1033 in Atholl, Perth, Scotland. He died after 1097 in Rescobie, Angus, Scotland.
Duncan Mormaer of Moray
Duncan Mormaer of was born about 1035 in Nithsdale, Dumfriesshire, Scotland.
Mael Muire (Melmar) Mormaer of Atholl
Mael Muire (Melmar) Mormaer of was born about 1038 in Atholl, Perthshire, Scotland.
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