The first of these was the infamous Cearbhall macD?nlainge, lord of Osraighe, who about the year 845 is found as the victor in a great battle against the foreigners of Ath Cliath [Norsemen of Dublin] at Carn Brammit. The next year we find the Osraighe defeated by the Leinstermen, perhaps in liege with the foreigners, at the battle of Uachtar Garadha. About the same year, 846, the Osraighe move on to inflict a defeat on their neighbors to the southwest, the Deisi. In 851 Cearbhall is cited for his part in the slaying of the lord of south Leinster, that is, Eachtighern, son of Guaire.