The Muilrea and Ben Gorm range, bounding the fine fjord of Killary Harbour, is formed of terraced Silurian rocks, from Bala to Ludlow age.
The Saxons had been slowly reconquering the lost ground, and now Henry, advancing with his victorious army into Jutland, forced Gorm, the Danish king, to become his vassal and regained the land between the Eider and the Schlei.
Hardecnuth Urm is to be identified with the famous Gorm the old, who married Thyra Danmarkarbot: their son was Harold Bluetooth.
An interesting example of the great timber-chambered barrow is that at Jelling in Jutland, known as the barrow of Thyre Danebod, queen of King Gorm the Old, who died about the middle of the 10th century.
So it appears in the history given by Saxo Grammaticus of the voyage to Bjarmaland of one " Gorm the old."
Towards the west end is Eilean Gorm (the green isle), and near the north-western shore are the falls of Ledard.