 In 1590 when Aodh Ruadh Ó Domhnaill (Red Hugh O'Donnell) was held in Dublin Castle, his half-brother, Domhnall, attempted to wrest Tír Conaill from his father Aodh.Aodh Ruadh's mother in response mustered a large force of Scots and also the Mac Suibhne branches of Na Tuatha and Fanad to oppose Domhnall.During this time Donnchadh.