The Eóganachta (or Eoghanachta), by tradition founded by Eógan, king of
Munster, the firstborn son of the semi-mythological third-century king Oilill Ollum, was an Irish dynasty centred around Cashel which dominated southern Irelandfrom the 5th to the 16th century. Eógan had a younger brother, Cas, who is said to have originated the rival Dál gCaisdynasty of Ireland. The Dál gCais displaced the increasingly divided Eóganachta during the course of the 10th century. [cite book | last = Lalor | first = Brian | title = The Encyclopedia of Ireland| publisher = Yale University Press| date = 2003 | pages = 360 | id = ISBN 0-300-09442-6]
Ó Scannail of Munster must have been a sept of some significance, for it is recorded that in 1014, Eocha, son of Dunadbach, Chief of Clann Scannail, and Scannail son of Cathal, Lord of Eoghanacht Locha Léin (the most powerful clan grouping in Munster at the time), were killed at the battle of Clontarf.
Eóganachta surnames include MacCarthy, O'Sullivan, O'Mahony, O'Donoghue, O'Moriarty, O'Keefe, O'Callaghan and Scannell. Also included are the Ui Fidgeinte (e.g. the O'Donovans), non-subject allies of the Eoganachta (Cashel) who may have originally belonged to the Erainn as some claim, although it is just as likely the Uí Fidgeinti were a more senior branch of the Eoganachta excluded from the innovative politics at Cashel.
The septs or branches of the Eóganachta and some of their more notable members include:
Eóganacht Chaisilof Cashel
Feidlimid mac Cremthanin(died 847)
Cormac mac Cuilennáin(died 908)
Eóganacht Airthir Cliach
Fergus Scandal mac Crimthainn(died 582)
* Dál gCais
Brian Boru(died 1014)
* Uí Fidgeinti
Cathal Cú-cen-máthairmac Cathaíl (died 665 or 666)
Eóganacht Locha Léin
Áed Bennánmac Crimthainn (died between 619 and 621)
* Eóganacht Maige Geirginn. The plain of Circinn is thought to be the area of
Angusand the Mearnsin Scotland.
Óengus I of the Picts(died 761)
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