as "Magh Ua mBriuin" at least as late as 1149. This likely denotes the domain of the "king of Uí Briúin", a title borne primarily by men of the Uí Briúin Seóla. 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". See also Nuala na Meadóige Ní Fionnachta Annalistic references 801. Connmhach, Judge of Uí Briúin, died. References Byrne, Francis John, Irish Kings and High-Kings. Batsford, London, 1973. A 9th century Uí Briúin settlement in County Cavan Connachta Gaelic-Irish nations and dynasties Gaels