Irish clans
Irish clans are traditional kinship groups sharing a common surname and heritage and existing in a lineage-based society, originating prior to the 17th century. A clan included the chief and his patrilineal relatives; however, Irish clans also included unrelated clients of the chief. These unrelated clients and their agnatic descendants were ineligible to be elected chief, but nonetheless assumed the name of the leading lineage as a show of allegiance.
Beginning in the 8th century, various genealogical collections were compiled purporting to trace the ancestry of these clans. Among them are genealogies in Rawlinson B 502, the Book of Ballymote, the Book of Lecan, the Leabhar Mór na nGenealach compiled by Dubhaltach MacFhirbisigh, and the Ó Cléirigh Book of Genealogies. In all of these cases, the genealogies listed state the agnatic descent of the chiefs and chieftains, and not necessarily every member of the clan. At least one genetic study has concluded that while these genealogies appear fairly accurate back to the Middle Ages, they are unreliable before the 7th century.
Definition of "clan"
The Irish word clann is a borrowing from the Latin planta, meaning 'a plant, an offshoot, offspring, a single child or children, by extension race or descendants'. For instance, the O'Daly family were poetically known as Clann Dalaigh, from a remote ancestor called Dalach.Clann was used in the later Middle Ages to provide a plural for surnames beginning with Mac meaning 'son of'. For example, "Clann Cárthaigh" meant the men of the MacCarthy family and "Clann Suibhne" meant the men of the MacSweeny family. Clann was also used to denote a subgroup within a wider surname, the descendants of a recent common ancestor, such as the Clann Aodha Buidhe or the O'Neills of Clandeboy, whose ancestor was Aodh Buidhe who died in 1298. Such a "clan", if sufficiently closely related, could have common interests in landownership, but any political power wielded by their chief was territorially based.
From ancient times, Irish society was organised around traditional kinship groups or clans. These clans traced their origins to larger pre-surname population groupings or clans such as Uí Briúin in Connacht, Eóganachta and Dál gCais in Munster, Uí Néill in Ulster, and Fir Domnann in Leinster. Within these larger groupings there tended to be one sept who through war and politics became more powerful than others for a period of time and the leaders of some were accorded the status of royalty in Gaelic Ireland. Some of the more important septs to achieve this power were O'Connor in Connacht, MacCarthy of Desmond and O'Brien of Thomond in Munster, Ó Neill of Clandeboy in Ulster, and MacMorrough Kavanagh in Leinster.
The largely symbolic role of High king of Ireland tended to rotate among the leaders of these royal clans. The larger or more important clans were led by a taoiseach or chief who had the status of royalty and the smaller and more dependent clans were led by chieftains. Under Brehon law, the leaders of Irish clans were appointed by their kinsmen as custodians of the clan and were responsible for maintaining and protecting their clan and its property. The clan system formed the basis of society up to the 17th century.
Origins
The O'Rahilly doctrine
According to T. F. O'Rahilly, in his works Goides and Their Predecessors and later Early Irish History, there was a total of four waves of Celtic invasions of the British Isles and that the first three of these were pre-Gaelic. According to O'Rahilly, these were people who had largely remained unconquered by the Romans whose territory was mostly restricted to the broad plains of England. A larger part of England remained out of the control of the West Germanic people who invaded after the imperial collapse of Roman Britain and who founded the English nation.O'Rahilly's version of the origins of the Irish, as supported by C. Thomas Cairney and John Grenham is as follows: The first of the Celtic invaders of Ireland were known as the Cruthin who arrived between 800 and 500 BC.
The second wave of Celts to come to Ireland were known as the Erainn and this is supposedly where the Gaelic name for Ireland, Erin, originated. These people arrived between 500 and 100 BC. They came from the area which is today known as Belgium and had superior iron weaponry, and thus eventually reduced the Irish Cruthin to tributary status. The third wave of Celtic settlement in Ireland came from Continental Europe during the first century BC and this was probably because of pressure from the Romans on the south of Gaul. These people were known as the Dumnonii and gave their name to Devon in England. Their most powerful branch in Ireland was the Laigin who gave their name to Leinster. A branch of the Irish group of the Dumnonii settled just to the south of Dumbarton in Scotland and were the ancestors of the Strathclyde-Britons.
The fourth and last major Celtic settlements in Ireland took place around 50 BC. This was directly because of Roman attempts to dominate the Gauls of Continental Europe. This included, among others, a group known as the Feni who came to Ireland directly from the Continent and according to tradition landed in south Kerry and the Boyne estuary. The earlier inhabitants of the country fiercely resisted the newcomers who were referred to as the Gaeil because they spoke the Gaelic language. The power and influence of the Gaeils gradually spread over the next three centuries, northwards, from Kerry into Tipperary and Limerick, as well as to the west into Galway and Roscommon. By the 5th century they were dominant in most of Ireland and had established dynasties and tribal groups. These groups determined the Irish politics and culture until the Norman invasion of Ireland which took place during the late 12th century.
Modern opinion
O'Rahilly's version of history has been questioned by archaeologists and historians who have played down the role of the Cruthin as invaders, including by Ian Adamson. O'Rahilly's history has been entirely unaccepted by some historians including Francis John Byrne. According to Myles Dillon and Nora K. Chadwick, while O'Rahilly's version of history has been accepted by some scholars and dismissed by others, it is an entirely traditional history that he had sourced from Lebor Gabála Érenn which was a historic manuscript written in the 11th century, also known as the Book of the Invasions of Ireland, and not historic facts based on contemporary evidence. J. P. Mallory stated that O'Rahilly has argued that this manuscript showed that the medieval people of Ireland had seen a series of invasions from whom various dynasties and families might have traced their origins to.According to Mallory, Ireland may have been inhabited by Paleolithic hunters, but that the evidence for this is only a few pieces of flint. The first actual evidence of human residence in Ireland dates to around 8000 BC. Evidence of the first Neolithic farmers in Ireland dates to around 4000 BC. There is little evidence of a warrior elite in Ireland before 1500 BC and evidence for this appears during the Bronze Age where everyone of a wealthy class had weaponry. The Irish language first appeared from between 700/600 BC and 400 AD during the Iron Age. During this time, the Irish people came into contact with Roman traders.
According to the writers of Ulster: An Illustrated History, there is evidence for the Ulaid who are referred to as the Erainn by some genealogists which is also the name given on Ptolemy's map of Ireland which dates from the second century AD for the Iverni who lived in County Cork, as well as being the origin of the name for Ireland. The centre of the Ulaid's land was in the Diocese of Down. The main population group of the Ulaid was the Cruthin whose territory was in the Diocese of Connor and Dromore. There is also evidence for the Loígis in Leinster and the Cíarraige in Munster who also belong to this group and it is possible that their ancestors in Ireland were pre-Celtic. It is also possible to identify from Ptolemy's map the Dál Riata of County Antrim who later founded a powerful kingdom in Argyll, Scotland. The 11th century Lebor Gabála Érenn or Book of the Invasions of Ireland, describes a series of failed invasions of Ireland before settlement in the 8th century. However, by the 8th century battles in Ireland were not between the natives and invaders but between tribes and dynasties for control of different parts of the island. Donnchadh Ó Corráin put the evidence for the Irish naitional identity back to the 7th century emphasising the impact that Christianity had on the people there.
In 1002, the Uí Néill lost the high kingship of Ireland to the leader of the Dal gCais or Dalcassians, Brian Boru. It was during the century of declining Uí Néill dominance that surnames first started being used in Ireland. This meant that Ireland was one of the first countries in Europe to start using surnames. Descendants of Niall of the Nine Hostages, who was the ancestor of the Uí Néill dynasty, include people with the surnames O'Boyle, O'Connor and O'Donnell. From the Dal gCais or Dalcassians came the surnames O'Brien and Kennedy.
Social structure
Within the Gaeil there was distinction between the tribes of the south from those of the north, and also from those of the west. The tribes in the south called themselves the Eoghanacht and in about the year 400 AD they established at Cashel a dynasty which held power throughout most of southern Ireland from the 5th to 12th centuries. The Munster families of O'Sullivan, MacCarthy and O'Connell claim descent from the Eoghanacht.In the midlands of Ireland, the Gaeil tribes were known as Connachta and their name continues in the modern province of Connacht. The most important of the Connacta tribes was the Uí Néill who claimed descent from Niall of the Nine Hostages. Niall's brothers included Ailill, Brion and Fiachra who were founders of the important Connachta tribes of Ui Ailella, Uí Briúin and Uí Fiachrach.
Although the Eoghanacht and Uí Néill were the most powerful tribal groups in Ireland, there were others who were locally powerful including the Airgíalla in the north-east where they controlled what is now the counties of Tyrone, Armagh, Fermanagh and Monaghan. There was also the Ulaidh who inhabited what is now the counties of Down and Antrim.
Within these large areas there were up to 150 small divisions known as túatha and the names of many of these are reflected today in the names of the Irish baronies that make up the modern counties. Each túath had a ruler or petty king who owed allegiance to a more powerful king who was over-king of three or more túatha. This over-king would in turn be subordinate to the king of a province, usually either the Eoghanacht or Uí Néill.
The succession of kings or chiefs was governed by a system known as Tanistry whereby after a chief had died, the new chief would be elected from all agnatic cousins descended from a patrilineal grandfather or great-grandfather. However, according to Eoin MacNeill, the system known as tanistry which also took place before the position of king or chief had become vacant is not found in records until the time of feudalism in Ireland which was not until the time of the Normans, and it was preceded by the similar system known as Rigdomna but which took place only after the position of king or chief had become vacant. This theory however, was disputed by Gearóid Mac Niocaill who stated that there is no good evidence to support that the usage of the term Rigdomna in early medieval Ireland was any different to that of tanaise in late medieval Ireland and that the two terms were synonymous with each other. Although Mac Niocaill did state that MacNeill was correct in identifying a number of cases where Rigdomna was limited to a four generation group in early medieval Ireland but in late medieval Ireland it was almost always the son, brother or nephew of the king.