 This seems to have settled affairs among the southern Uí Néill.In 719 Fergal began to impose his authority on Leinster and harrying expeditions are recorded.In 721 Cathal mac Finguine, king of Munster (died 742) and Murchad mac Brain Mut (died 727), king of Leinster attacked the lands of the southern Uí Néill and ravaged the plain of Brega.