 Edgar, now eldest son of Malcolm III, became King of Scotland in 1097, with the military support of his uncle Edgar the Ætheling who helped him to depose King Donald III.Since Edgar wasn't married, his heir presumptive was his next brother,

Alexander I, previously ruler of Lothian and Forth, became King of Scotland on the death of his elder brother Edgar, 8 January 1107.Since his marriage to Sybilla of Normandy was childless, his heir presumptive was his sole surviving brother,

David I, previously ruler of Lothian and Cumbria, became King of all Scotland on the death of his elder brother Alexander I, 23 April 1124.