Tyrone - Irish Place Names

Patrick Weston Joyce
1923

Tyrone. The descendants of Eoghan [Owen], son of Niall of the Nine Hostages, possessed the territory extending over the counties of Tyrone and Derry and the two baronies of Raphoe and Inishowen in Donegal; all this district was anciently called Tir-Eoghain [Tir-Owen: Wars of Gadhil with the Gaill], Owen's territory, which is now written Tyrone, and restricted to one county. See Inishowen.