What title was held by the man who was thought to have died at the Battle of Stamford Bridge, who also spent 15 years in exile?
Harald Hardrada Harald Sigurdsson (Old Norse: "Haraldr Sigurðarson" ;  1015 – 25 September 1066), given the epithet Hardråde ("harðráði ", roughly translated as "stern counsel" or "hard ruler") in the sagas, was King of Norway (as Harald III) from 1046 to 1066. In addition, he unsuccessfully claimed the Danish throne until 1064 and the English throne in 1066. Prior to becoming king, Harald had spent around fifteen years in exile as a mercenary and military commander in Kievan Rus' and of the Varangian Guard in the Byzantine Empire.
House of Wessex The House of Wessex, also known as the House of Cerdic ("Cerdicingas" in Old English), refers to the family that initially ruled a kingdom in southwest England known as Wessex, from the 6th century under Cerdic of Wessex until the unification of the Kingdoms of England by Alfred the Great and his successors (Though Alfred's grandfather Egbert was the one to start consolidating West saxon domination). Alfred and his successors would also be part of this dynasty, which would continue ruling in the main line all the way until Alfred's descendant, Ethelred the Unready, whose reign in the late 10th century and early 11th century saw a brief period of Danish occupation and following his and his son Edmund Ironside's death, kingship by the Danish Cnut the Great and his successors to 1042. The House of Wessex then briefly regained its power for 24 years, but after the deposition of its last scion, Ethelred's great-grandson Edgar Atheling would fade into the annals of history after the death of Edgar Atheling in 1125.