illegitimate son of King Olaf Haraldsson (later St. Olaf), by his English concubine Alfhild, originally a slave (thrall) of Olaf's queen Astrid Olofsdotter...

Æthelred had returned to England in a fleet provided by Olaf. In 1024, Cnut had offered to let Olaf govern Norway as his vassal; but after Helgeå, he set...