 The Uí Tuírtri territory would expand into the lands north of Lough Neagh as they were driven eastwards by the Northern Uí Néill about the 10th century.At one stage the O'Lynns ruled a territory stretching all the way to the sea deep in Ulaid territory.Cú Muighe Ó Floinn is cited as being king of the territories of Uí Tuirtri, Fir Lí, Dál Riata, and Dál nAraidi.