It was only with the support of the English king, William II that Edgar was able to take the Scottish throne. In 1097 with an army led by his uncle Edgar Atheling, Donald III the reigning Scottish king, was defeated in battle at Rescobie near Forfar.
In order to cement the relationship with England, his sister Matilda, plucked from a nunnery, subsequently married Henry I, the newly crowned English king.
Throughout his reign, Edgar retained a “submissive” association with England and was dubbed the ‘Peaceable’ after presenting the Western Isles to the king of Norway.
He was described by Ailred of Rievaulx as “sweet and lovable, employing no tyranny, no harshness, no greed against his people…”
Died in Edinburgh Castle
He was succeeded by his brother Alexander I.