Category
page 1Gaelic-Irish nations and dynasties
Dál Riata
Gaelic overkingdom that included parts of western Scotland and northeastern Ulster in Ireland

Ulaid
thumb|Ulaid during the 10th–11th century and its three main sub-kingdoms, along with some of its neighbouring kingdoms. These boundaries would be used as the basis for the dioceses created in the 12th century.
' (Old Irish, ) or (Modern Irish, ) was a Gaelic over-kingdom in north-eastern Ireland during the Middle Ages made up of a confederation of dynastic groups. Alternative names include , which is the Latin form of , and ', Irish for 'the Fifth'. The king of Ulaid was called the or .
Kingdom of Ossory
Osraige (Old Irish) or Osraighe (Classical Irish), Osraí (Modern Irish), anglicized as Ossory, was a medieval Irish kingdom comprising what is now County Kilkenny, western County Laois and parts of eastern County Tipperary, corresponding to the Diocese of Ossory. The home of the Osraige people, it existed from around the first century until the Norman invasion of Ireland in the 12th century. It was ruled by the Dál Birn dynasty, whose medieval descendants assumed the surname Mac Giolla Phádraig.
Cruthin
The Cruthin () or Cruithne () were a people of early medieval Ireland. Their heartland was in Ulster and included parts of the present-day counties of Antrim, Down and Londonderry. Although the evidence is that they were Gaels, their name is believed to be the Irish equivalent of *Pritanī, the reconstructed native name of the Celtic Britons, and Cruthin was sometimes used to refer to the Picts, but their relationship to these peoples is unclear.
Kingdom of Breifne
former country
Uí Néill
Irish dynasty
Northern Uí Néill
name given to several dynasties in north-western medieval Ireland

Iverni
thumb|upright=1.25|The Iverni ("Iwernoi" above) are one of the population groups mentioned in Ptolemy's Geography.
The Iverni (, '''') were a people of early Ireland, first mentioned in Ptolemy's 2nd century Geography as living in the far south-west of the island. He also names a "city" called Ivernis (, ') in their territory, and observes that this settlement has the same name as the island as a whole, Ivernia (, '). These Iverni are identified with the Érainn (Érnai, Érna), a people attested in Munster and elsewhere in the early Middle Ages. They included the Corcu Loígde, Corcu Duibne, Corc

Connachta
The Connachta are a group of medieval Irish dynasties who claimed descent from the legendary High King Conn Cétchathach (Conn of the Hundred Battles). The modern western province of Connacht (Irish Cúige Chonnacht, province, literally "fifth", of the Connachta) takes its name from them, although the territories of the Connachta also included at various times parts of southern and western Ulster and northern Leinster. Their traditional capital was Cruachan (modern Rathcroghan, County Roscommon).
Uí Ceinnselaig
Irish dynastic family
Dál gCais
The Dalcassians ( ) are a Gaelic Irish clan, generally accepted by contemporary scholarship as being a branch of the Déisi Muman, that became very powerful in Ireland during the 10th century. Their genealogies claimed descent from Tál Cas. Their known ancestors are the subject of The Expulsion of the Déisi tale and one branch of their blood-line went on to rule the petty kingdom of Dyfed in Wales during the 4th century; probably in alliance with the Roman Emperor Magnus Maximus.
Laigin
The Laigin, modern spelling Laighin (), were a Gaelic population group of early Ireland. They gave their name to the Kingdom of Leinster, which in the medieval era was known in Irish as Cóiced Laigen, meaning "Fifth/province of the Leinstermen" (Modern Irish Cúige Laighean), where their descendants ruled till the 17th century. Their territory, located in south-east Ireland, is thought to have once extended from the River Shannon to the River Boyne. The surnames of those descended from the Laigin are still counted amongst the most numerous in Ireland.
Dál Fiatach
Gaelic dynastic-grouping and territory
Uí Dúnlainge
dynasty of Irish kings
Southern Uí Néill
gaelic-Irish dynasty
Uí Fiachrach
Irish family
Tír Eoghain
Gaelic kingdom of ancient and Medieval Ireland
Uí Briúin
Irish family
Uí Garrchon
Dinastia of Leinster