Ealdgyth (circa 992 – after 1016), modern English Edith may have been the name of the wife of Sigeferth son of Earngrim, thegn of the Seven Burghs, and later of King Edmund Ironside.
The Anglo-Saxon Chronicle records that Sigeferth and his brother Morcar, described as "foremost thegns of the Seven Burghs" were killed at an assembly of the English nobility at Oxford.
[1] In the late summer of 1015, at some time between 15 August and 8 September, Edmund Ironside raised a revolt against his father King Æthelred.
[3] It is generally, but not universally, supposed that Ealdgyth, if that was her name, was the mother of Edmund Ironside's sons.
While Ealdgyth is a common female name in the period, this coincidence has raised the suspicion that the Worcester chronicler has confused Sigeferth's widow with his sister-in-law.