Task: Explanation
Input (English): 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. Question: 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? Answer: King of Norway
Output (English):  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.