[3][4][5] The Ó Rothláin families have a strong link with County Mayo, and Country Sligo in the province of Connacht, and belong to the Uí Fiachrach.

[8][9][10][11] Dubhaltach Mac Fhirbhisigh states in a poem written in 1417 that, Coolcarney "embraced the territory between Beel Lasa (or Foxford) and the Brosnach river in Castleconnor.

"[12] William Gregory Wood-Martin wrote that the family territory included Cluain na gCliabhrach (anglicised as Cloonagleavragh).

[13] Mac Fhirbhisigh describes "O'Rothlain the Ready" as one of four chieftains in Coolcarney and states that they were a "festive party.

"[15] Members of the Ó Rothláin sept are recorded in The Tribes, Customs and Genealogies of the Hy Fiachrach by O'Donovan.