Sybilla married Alexander I King of Scots, 'the Fierce', son of Malcolm III 'Ceannmor', King of Scots and Margaret Queen of Scots.1 (Alexander I King of Scots, 'the Fierce' was born about 1076, died on 23 April 1124 in Stirling, Scotland 1 and was buried in 1124 in Dunfermline Abbey, Fife, Scotland 1.)
"Alexander I. 'the Fierce', also son of Malcolm Ceannmor, succeeded his brother; married Sybilla, illegitimate daughter of Henry I. of England by Sybilla Corbet. She died at Loch Tay 12 July 1122. He died without legitimate issue 23 April 1124 at Stirling, and was buried at Dunfermline. He had an illegitimate son, Malcolm, who attempted to gain the crown."
1 e-books, The Scots Peerage ed. Sir James Balfour Paul vol. 1 (1904).
e-books, The Scots Peerage ed. Sir James Balfour Paul vol. 5 (1908).