 The king of Fortriu Eógan mac Óengusa and the king of Dál Riata Áed mac Boanta were among the dead in a major defeat to the Vikings in 839.Another early reference to the Norse presence in the Irish records is that there was a king of "Viking Scotland" whose heir, Thórir, brought an army to Ireland in 848.Caittil Find was a reported leader of the "Gallgáedil" fighting in Ireland in 857.