This was a territory in the north of the present county of Longford, comprising the mountainous district now called Sliabh Chairbre, otherwise the Carn Mountains. Lanigan in his Ecclesiastical History of Ireland, vol. ii. p. 100, is puzzled to distinguish the territories of Carbury in Meath from each other; and Duald Mac Firbis falls into an error in placing Cairbre Ua g-Ciardha in Conmhaicne Maighe Rein, i.e. Mac Rannall's country, in the county of Leitrim. See his Genealogical work (Marquis of Drogheda's copy, p. 217). But the exact situation of Cairbre-Gabhra and Cairbre-O'g-Ciardha can be easily determined from the topographical poems of O'Dugan and O'Heerin, in which O'Ciardha is placed in Leinster, south of the Eiscir Riada, and O'Ronan, Chief of Cairbre Gabhra, in the ancient Meath. See Genealogies, Tribes, and Customs of Hy-Fiachrach, p. 276, note g, and p. 475. The fact is that Cairbre-O'g-Ciardha is the present barony of Carbury in the county of Kildare, and Cairbre-Gabhra is the present barony of Granard in the county of Longford, where the sons of Cairbre, the son of Niall, were seated in St. Patrick's time, to whom they granted a beautiful place called Granard. See O'Flaherty's Ogygia, part iii. c. 85. The following entry in the Annals of Connaught, at the year 1420, will shew that the castle of Granard was in the territory of Cairbre Gabhra: 'Caislen Granaird i Cairpre Gabrai do gabháil for h-Uilliam Hua Fergail do Gallaib. Gaill do tréccadh an caisléin iar sein, & Uilliam dá brisead ar oman Gall.' 'The castle of Granard, in Cairpre Gabrai, was taken from William O'Farrell by the English. The English afterwards abandoned the castle, and William demolished it from fear of the English.' The mountainous parts of this barony still retain the name Cairbre, and the vivid traditions in the country respecting the curse pronounced by St. Patrick on the territory, where he was treated with indignity by the incredulous Cairbre, the monarch's brother, shew clearly that the district about Granard was originally called Cairbre. This is further corroborated by the account of the Attacottic tribes in Ireland in the second century, preserved in the Book of Lecan, and transcribed by Duald Mac Firbis into his genealogical work, in which it is stated that a tribe called Tuath-Glasraighe had been seated in Cairbre and in the adjoining districts around Lough Sheelin, until they were dispossessed by Tuathal Teachtmhar. It has already been stated that the mountainous portion of the barony of Granard still retains the name of the territory, and that the highest elevations of the district are called the Carn mountains; and it may be worth while to add here that, according to the Dinnsenchus, the carns from which this name has been derived were called Carn-Fubuidhe and Carn-Maine, which are described as on the summits of Sliabh Chairbre. After the O'Farrells had extended their power over the whole of North Teffia, they divided the territory of Cairbre-Gabhra into two parts, of which the northern or mountainous portion was called Sliabh Chairbre, and the southern or more level portion Clann-Seeain or race of Shane, or John, from the sept of the O'Farrells who possessed it. For a list of the townlands comprised in the district of Sliabh Chairbre, or, as it is anglicised, Slewcarberie, see Inquisition taken at Ardagh on the 4th day of April, in the tenth year of the reign of James I.