614–615), Mac Fhirbhisigh lists the patrimony of Ó Caomháin in Carra, County Mayo as "the seven townlands of Ros Laogh, from Cluain Lis (or Leasa) Néilín to Béal Átha na Lúb, and from Béal Átha na gCarr to Muileann Toirmáin, which were obtained by Caomhán s. Connmhach from Dubhda, his brother, and by Aodh Ó Caomháin from Aodh s. Ceallach, gs.
At 276.11 Inis Screabhainn, noted as both the foregoing and Soighean Uise tar Abhainn, is called "The chief homestead of Ó Caomháin."
Following the Anglo-Irish invasion and settlement of Connacht in the middle decades of the 12th-century, families such as the Clann Chaomháin lost their territories, been exiled or becoming tenants-at-will under the new lords.
King Sén-Brian Ó Dubhda of Ui Fiachrach Muaidhe (died 1354) regained much of these territories but mostly allotted them to his own followers.
A more fulsome entry, sub anno, 1306, occurs in the same annal: A great depredation was committed by the Clann-Murtough O'Conor in the territory of Carbury.
David O'Caomhain, Chief of that tract of country extending from Tuaim-da-Bhodar to Gleóir, a rich and affluent brughaidh farmer, Donough Mac Buidheachain, and many others, were slain on this predatory incursion.