The Delbhna Nuadat were lords of a large section of what is now Athlone in County Roscommon, situated between the Suca and Shannon rivers. A branch of the larger Delbhna population group, they were from the early historic era a subject people of the Ui Maine. In 759, Diumasach Lord of Delbhna Nuadat drowned in an incident called "The shipwreck of the Dealbhna Nuadhat on Loch Ribh." The chiefs of Delbhna Nuadat eventually took the surname O'Flannagain or O’Flanagan.