Cerball next appears to have allied himself with two Norse or Norse-Gael "kings", Amlaíb Conung, "son of the king of Lochlann", and Ímar, called "king of the Norsemen of all Ireland and Britain" at his death in 873 [REF].
In 870 Áed Finnliath brought a large army to Leinster and Cerball accompanied him.