In 759 Dúngal mac Amalgado, King of Brega, fought the Battle of Emain Macha against Fiachnae mac Áedo Róin, King of Ulaid.
The Annals of Tigernach for 759 state- "The battle of Emain Macha between the Ulaid and the Uí Néill, with Airechtach the priest of Armagh pushing in discord with the abbot of Fer da Crich, where Dungal grandson of Conaing and Donn Bó were killed.