Brian Boru was an Irish king who ended the domination of the High Kingship of Ireland by the Uí Néill, and probably ended Viking invasions of Ireland. Brian built on the achievements of his father, Cennétig mac Lorcain, and especially his elder brother, Mathgamain. Brian first made himself king of Munster, then subjugated Leinster, eventually becoming High King of Ireland. He was the founder of the O'Brien dynasty, and is widely regarded as one of the most successful and unifying monarchs in medieval Ireland.
There are four provinces of Ireland: Connacht (Connaught), Leinster, Munster, and Ulster. The Irish word for this territorial division, cúige, meaning "fifth part", suggests that there were once five, and at times Meath has been considered to be the fifth province; in the medieval period, however, there were often more than five. The number of provinces and their delimitation fluctuated until 1610, when they were permanently set by the English administration of James I. The provinces of Ireland no longer serve administrative or political purposes but function as historical and cultural entities.
Monarchical systems of government have existed in Ireland from ancient times. In most of Ireland, this continued until 1949, when it transitioned to being the Republic of Ireland. Northern Ireland, as part of the United Kingdom, remains under a monarchical system of government.
Ruaidrí mac Tairrdelbach Ua Conchobair was King of Connacht from 1156 to 1186, and High King of Ireland from 1166 to 1198. He was the last High King of Ireland before the Anglo-Norman invasion.
Thomond, also known as the kingdom of Limerick, was a kingdom of Gaelic Ireland, associated geographically with present-day County Clare and County Limerick, as well as parts of County Tipperary around Nenagh and its hinterland. The kingdom represented the core homeland of the Dál gCais people, although there were other Gaels in the area such as the Éile and Eóganachta, and even the Norse of Limerick. It existed from the collapse of the Kingdom of Munster in the 12th century as competition between the Ó Briain and the Mac Cárthaigh led to the schism between Thomond and Desmond. It continued to exist outside of the Anglo-Norman-controlled Lordship of Ireland until the 16th century.
West Connacht was a kingdom of Gaelic Ireland, associated geographically with present-day County Galway, particularly the area known more commonly today as Connemara. The kingdom represented the core homeland of the Connachta's Uí Briúin Seóla kindred and although they ruled, there were smaller groups of other Gaels in the area, such as the Delbhna Tir Dha Locha and the Conmhaícne Mara. It existed from 1051 onwards, after the Ó Conchobhair, Kings of Connacht, pushed the Ó Flaithbheartaigh to the West of Lough Corrib, from their original territory of Maigh Seóla. Iar Connacht remained a subordinate túath of Connacht, until the 13th century, after which it was more independent.
Toirdhealbhach Mór Ua Conchobhair anglicised Turlough Mór O'Conor, was King of Connacht (1106–1156) and High King of Ireland.
Muircheartach Ua Briain, son of Toirdelbach Ua Briain and great-grandson of Brian Boru, was King of Munster and later self-declared High King of Ireland.
The Battle of Móin Mhór was fought in 1151 between the kingdoms of Leinster and Thomond in Ireland. The Kingdom of Leinster was victorious.
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.
Murrough O'Brien, 1st Earl of Thomond was the last King of Thomond, and a descendant of the High King of Ireland, Brian Boru.
The Kingdom of Munster was a kingdom of Gaelic Ireland which existed in the south-west of the island from at least the 1st century BC until 1118. According to traditional Irish history found in the Annals of the Four Masters, the kingdom originated as the territory of the Clanna Dedad, an Érainn tribe of Irish Gaels. Some of the early kings were prominent in the Red Branch Cycle such as Cú Roí and Conaire Mór. For a few centuries they were competitors for the High Kingship or Ireland, but ultimately lost out to the Connachta, descendants of Conn Cétchathach. The kingdom had different borders and internal divisions at different times during its history.
Donnchadh mac Briain, son of Brian Bóruma and Gormflaith ingen Murchada, was King of Munster.
Domnall Mór Ua Briain, or Domnall Mór mac Toirrdelbaig Uí Briain, was King of Thomond in Ireland from 1168 to 1194 and a claimant to the title King of Munster. He was also styled King of Limerick, a title belonging to the O'Brien dynasty since Brian Boru's sacking of the Hiberno-Norse city state after the Battle of Sulcoit in the 10th century.
The O'Kennedy family, sometimes Kennedy, were an Irish royal dynasty, a sept of the Dál gCais, founded in the Middle Ages who were Kings of Ormond. Their founder was the nephew of High King Brian Boru (1002–1014). The name Cinnéide belonged to Brian Boru's father Cennétig mac Lorcáin, King of Thomond, in the tenth century AD.. The Kennedys did not descend directly from Brian Boru, but from Cinnéide's eldest son Donncuan. Donncuan's son Mahon was the first to call himself Ó Cinnéide which is Irish for grandson of Cinnéide.
Cormac Mac Cárthaigh was a Gaelic Irish ruler who was King of Munster. A member of the Mac Cárthaigh clan of the Eóganacht Chaisil, he was the final king of the unified Kingdom of Munster before the realm was divided into the Kingdom of Desmond and Kingdom of Thomond in the aftermath of the Treaty of Glanmire.
Middle Third is a barony in County Tipperary, Ireland. This geographical unit of land is one of 12 baronies in County Tipperary. Its chief town is Cashel. The barony lies between Eliogarty to the north, Iffa and Offa East to the south, Clanwilliam to the west and Slievardagh to the east. It is currently administered by Tipperary County Council.
The O'Brien dynasty is a noble house of Munster, founded in the 10th century by Brian Boru of the Dál gCais (Dalcassians). After becoming King of Munster, through conquest he established himself as Ard Rí na hÉireann. Brian's descendants thus carried the name Ó Briain, continuing to rule the Kingdom of Munster until the 12th century where their territory had shrunk to the Kingdom of Thomond which they would hold for just under five centuries.
