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The Duan Albanach says that he reigned "without dissension", but there is a report of an expedition by Conall and Colmán Bec mac Diarmato of the Southern Uí Néill to Iardoaman in the Annals of Ulster for 568.
The remainder of the southern Uí Néill formed the kingdoms of Tethbae, in the north-west midlands, north and west of the River Inny and east of the River Shannon, and Brega in the east midlands, east of the upper part of the River Boyne and its tributary the River Blackwater.