Tostig Godwinson (c. 1029 – 25 September 1066) was an Anglo-Saxon Earl of Northumbria and brother of King Harold Godwinson. After being exiled by his brother, Tostig supported the Norwegian king Harald Hardrada's invasion of England, and was killed alongside Hardrada at the Battle of Stamford Bridge in 1066. Background. Tostig was the third son of the Anglo-Saxon nobleman Godwin, Earl of Wessex and Gytha Thorkelsdóttir, the daughter of Danish chieftain Thorgil Sprakling.
https://en.wikipedia.org/wiki/Tostig_Godwinson