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.
Lord Wentworth's Regiment Lord Wentworth's Regiment was a regiment of infantry raised during the exile of King Charles II during the Interregnum. Formed as the Royal Regiment of Guards in 1656 at Bruges under the command of the Earl of Rochester, it was made up of men who remained loyal to the King and had followed him into exile. When Rochester died in February 1658 command passed to Thomas Wentworth, 5th Baron Wentworth. The regiment served as part of the Spanish Army during the Franco-Spanish War and the concurrent Anglo-Spanish War in the Spanish Netherlands and saw action at the Battle of the Dunes (1658) under the command of Wentworth, before accompanying the King back to England to reclaim the throne at the Restoration in 1660. In 1665, the regiment was amalgamated with John Russell's Regiment of Guards to form the 1st Regiment of Foot Guards.