Eoghanacht ( The Eugenians)

The Eugenians, ruled as kings over Desmond or South Munster, which comprised the whole of the present county Cork, and the greater part of Kerry, together with a portion of Waterford, and a sl part of the south of Tipperary, bordering on Cork; while the Dalcassian kings ruled over Thomond. Oilill Olum became King of Munster and, as head of both the Eberian and Ithian tribes he became the first true King of the whole province. Thereafter the Kingship of Munster was handed down in Oilill Olum's family. Oilill willed, and his will was observed for many centuries, that the crown of Munster should henceforth alternate between the descendants of his two eldest sons, Eogan Mor and Cormac Cas.
  • The MacCarthys are descended from Eogan Mor
    • The descendants of Eoghan Mór, son of Aillil Olumm (Oilill Olum)
      The Eóghanacht Dynasties include the septs of the Eóghanacht Locha Lein, Eóghanacht Maige, Eóghanacht Raithlind, Eóghanacht Airthir Chliach, Eóghanacht Glendamnach, Eóghanacht Chaisil, Eóghanacht Aine, Uí Fidgeinti, Uí Liathain, Uí Maic, Uí Echach Muman, Uí Corpri
  • The O'Briens are descended from Cormac Cas
  • The O'Carrolls are descended from Oilill Olum's youngest son Ciann and his son Taig

Of these the Chief families --the head of the Engenian race, were kings and princes of Desmond.

  • MacAuliffe
  • MacCarthy
    • The MacCarthys, the O'Sullivans and the O'Callaghans, all of Eoghanacht Caisil stock, migrated southwards into Counties Cork and Kerry in pre-Norman times, ousted from their original lands in Counties Tipperary and Limerick by the aggression of the Dál Cais. From longer established tribal groupings in County Cork, such as the Corca Laidhe, the Muscraighe and the Eoghanachts of the Cork region, emerged such family names as O'Driscoll, O'Leary, Cronin; Murphy; O'Mahony and O'Keeffe, respectively.
  • MacDonagh
  • MacElligot
  • MacFinneen
  • MacGillicuddy
  • O'Callaghan
    • The MacCarthys, the O'Sullivans and the O'Callaghans, all of Eoghanacht Caisil stock, migrated southwards into Counties Cork and Kerry in pre-Norman times, ousted from their original lands in Counties Tipperary and Limerick by the aggression of the Dál Cais. From longer established tribal groupings in County Cork, such as the Corca Laidhe, the Muscraighe and the Eoghanachts of the Cork region, emerged such family names as O'Driscoll, O'Leary, Cronin; Murphy; O'Mahony and O'Keeffe, respectively.
  • O'Cullen
  • O'Donohoe
    • The Eoghanachta ruling families were the O'Mahony's and the O'Donoghues. Other names have descended in the form of Spillane, Ó Neill, Long, Flynn, Keating, Ring, Canty, Mehigan, Dillon, Healy, Slattery, Coghlan, Cahalane,Canniffe, Heenigan, Flahive, Hurley, Wholey, Kearney, etc.
  • O'Finnegan
  • O'Flannery
  • O'Fogarty
  • O'Keeffe
  • O'Kerwick (anglicised "Berwick" and "Kirby")
  • O'Lechan (or Lyons)
  • O'Mahony
    • The Eoghanachta ruling families were the O'Mahony's and the O'Donoghues. Other names have descended in the form ofSpillane, Ó Neill, Long, Flynn, Keating, Ring, Canty, Mehigan, Dillon, Healy, Slattery, Coghlan, Cahalane,Canniffe, Heenigan, Flahive, Hurley, Wholey, Kearney, etc.
  • O'Meehan
  • O'Moriarty
  • O'Sullivan
    • The MacCarthys, the O'Sullivans and the O'Callaghans, all of Eoghanacht Caisil stock, migrated southwards into Counties Cork and Kerry in pre-Norman times, ousted from their original lands in Counties Tipperary and Limerick by the aggression of the Dál Cais. From longer established tribal groupings in County Cork, such as the Corca Laidhe, the Muscraighe and the Eoghanachts of the Cork region, emerged such family names as O'Driscoll, O'Leary, Cronin; Murphy; O'Mahony and O'Keeffe, respectively.
  • O'Treacy
  • etc