 Having made himself undisputed leader of the Norsemen in Dublin – whether Findgaill or Dubgaill – Amlaíb departed for Britain, where he was involved in numerous military campaigns.When Amlaíb returned to Dublin in 856 or 857, he was accompanied by two of his brothers, Ímar () and Auisle ().Ímar has been identified with Ivar the Boneless (), a semi-legendary character who appears in the Old Norse sagas.