 The saga also relates that the Ulaid were allied to Leinster and that the king of Airgialla was slain fighting for the high king.According to later poems in the "Book of Leinster," which record his "seven blows against Brega" (later ruled by the Síl nÁedo Sláine), he may also have reconquered lands lost to the Uí Néill in the midlands of Ireland.This is also mentioned in the annals dated to 599.