 Ímar disappears from the Irish Annals in 864, and does not reappear until 870.Downham concludes he is identical to Ivar the Boneless, a Viking leader who was active in England during this period as a commander of the Great Heathen Army.According to O Croinin "Ímar has been identified with Ívarr Beinlausi (the boneless), son of Ragnar Lodbrok, but the matter is controversial".