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 (or fine in Irish) included the chief and his patrilineal relatives; however Irish clans also included unrelated clients of the chief. History 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, Eóghanachta and Dál gCais in Munster, Uí Neill in Ulster, and Fir Domnann in Leinster. Within these larger groupings there tended to be one sept (division) 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 Ó Conor in Connacht, MacCarthy of Desmond and Ó 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