 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.Ealdorman Eadric Streona is said to have killed them "dishonourably" after having invited them to his rooms.The Seven Burghs, otherwise unknown, are presumed to have been the Five Burghs and Torksey and York.