The following ancient territories, were in existence from prehistoric times to
the break-up the Gaelic order in the sixteenth century:
Breffny (Breifne): Cavan and west Leitrim.
Corca Laoidhe: South-west Cork.
Dalriada: North Antrim.
Decies (D�ise): West Waterford.
Desmond (Deasmhumhan): Kerry and much of Co. Cork.
Iar Connacht: West Connacht, mainly Connemara.
Muskerry (Muscraidhe) North-west and central Cork.
Oriel (Orghialla): Cos. Armagh and Monaghan and parts of south Down, Louth
Ormond (Urmhumhan): Much of Co. Kilkenny and north Tipperary.
Ossory: The extent of the ancient kingdom of Osraighe was apporoximately the
same as that of the diocese of Ossory, ie. Co. Kilkenny and some adjacent areas.
Thomond (Tuathmhumhan): Most of Co. Clare with adjacent parts of Cos.
Limerick and Tipperary.
Tirconnell (Tir Chonaill): Co. Donegal.
Tirowen (Tir Eoghain): Co. Tyrone with adjacent part of Co. Derry.