Kings of Corco Modhruadh

The Kings of Corco Modhruadh reigned over an area that was coextensive with the diocese of Kilfenora.

In the 12th-century, the kingdom into Corco Modhruadh Iartharach ("Western Corcomroe") and Corco Modhruadh Oirthearach ("Eastern Corcomroe") also known as Boireann. These districts were fuled by the Ó Conchubhair Corcomroe and Ó Lochlainn families, respectively.

In the 16th-century these areas became the English administrative baronies of Corcomroe and Burren.