Uí Briúin

According to Tírechán, Saint Patrick visited the "halls of the sons of Brión" at Duma Selchae (located by John O'Donovan in Mag nAí and alternatively by Roderic O'Flaherty near Loch Cime), but does not give their names.

This confusion surrounding the location of Mag Selce as mentioned in the Tripartite caused Nicholls to suggest that the geographical origin of the Uí Briúin was moved for political reasons to near Cruachan by the time of Tírechán.

[8] Intriguingly, the Book of Ballymote calls Cellach mac Rogallaig "King of Conmaicne",[9] a title also commonly taken by members of the Uí Briúin Bréifne branch in later centuries.

With the inclusion of Máenach mac Báethíne,[14] ancestors of all three major branches of the dynasty are mentioned in the annals as residing or fighting in the Maigh Seóla region in the 7th century.

[16] As Knox points out, these kings were distinguished at an early date from the Síol Muireadaigh of central Roscommon in the Book of Rights, suggesting that the lands of the Uí Briúin Seóla were the original "Hy Briuin".