English Heritage is mounting a search for the rightful heir to the English throne—"rightful" in an alternate universe where the Norman Conquest never happened.
Edgar Aetheling was named heir apparent by his great-uncle King Edward the Confessor but was not crowned when the King died in 1066 because he was too young. Harold II was crowned instead.
William the Conqueror crossed over from Normandy, defeating Harold at the Battle of Hastings. The teenage Aetheling later submitted to William.
English Heritage, which seeks to protect the country's historical environment, asks in its advertisements: "Are you of Edgar the Aetheling's lineage and believe you have a legitimate claim?" [Link]