This region (Irish: tuatha) of Cliú is centred on the historical barony of Smallcounty in eastern Limerick.
The Eóganacht Áine were considered part of the 'inner circle' of Eóganachta dynasties.
This rotation was broken by Máel Dúin mac Áedo of Eoganacht Locha Léin.
The main clan in the 7th and 8th centuries were known as the Ua nÉnna, descended from Énda mac Crimthainn, the grandson of Ailill.
One of the last Kings of Munster from this house was Cenn Fáelad hua Mugthigirn.