The history of these years is uncertain, but after the decline of the "Eóganacht Árann" the local "Corco Modhruadh" likely fell under the control of the "Uí Fiachrach Aidhne", a tribe from what is now southern Galway, who prospered in the 7th century. The local tribes were then probably subjects of the "Eóganacht Locha Léin" until their influence declined in the early 9th century. Whether the "Corco Modhruadh" still existed as a distinct group at that point is uncertain, as they and their neighbours "Corcu Baiscind" may have been assimilated into or conquered by the "Déisi Tuisceart" of eastern Clare, who won a major battle against the "Corco Modhruadh" in 744. By the 9th century, the "Corco Modhruadh" had been driven into the Burren uplands.