In the 730s, Óengus fought against Dál Riata whose traditional overlords and protectors in Ireland, the Cenél Conaill, were much weakened at this time.
Na década de 730, Óengus loitou contra Dál Riata, cuxos tradicionais señores e protectores de Irlanda, os Cenél Conaill, estaban daquela debilitados.