This sept had their royal seat at Maistiu (Mullaghmast) in South Kildare.
He was the son of Muiredach mac Brain (died 818), a previous king.
[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.
[3] In 868 the annals record that the Laigin participated with the Uí Néill of Brega and Norse at the Battle of Cell Ua nDaigri on the Boyne estuary.
[citation needed] His son Ailill mac Dúnlainge (died 871) was also a King of Leinster.