 Some evidence comes from a document known to historians as "Gospatric's Writ", one of the earliest documents to do with Cumbrian history.Siward aided his kinsman Malcolm III of Scotland, possibly known as 'the King of the Cumbrians' (but possibly confused with Owen the Bald of Strathclyde) at the Battle of Dunsinane in 1054, against Macbeth who, although escaping, was eventually killed in 1057.Despite this receipt of help, Malcolm invaded Northumbria in 1061, possibly trying to enforce his claim as 'King of the Cumbrians', (that is, to regain the lost territory of Cumbria south of the Solway taken by Siward), whilst Siward's successor as earl, Tostig Godwinson, was away on pilgrimage.