This sept had their royal seat at Naas in the eastern part of the Liffey plain, Airthir Liphi.
He was the son of Diarmait mac Ruadrach (died 832), King of Airthir Liphi.
[1] The succession of kings in Leinster is difficult to follow in his time.
Another previous king was Ruarc mac Brain who died in 862.
[2] Francis John Byrne suggests that the root of this apparent confusion lay in the fact that the Uí Dúnlainge kings exercised little real authority due to the aggressions of their western neighbour Cerball mac Dúnlainge (died 888), King of Osraige.