Kingdom of Desmond
The Eóganacht Chaisil under the MacCarthys would later form the much more militarily capable but undermanned Kingdom of Desmond. The O'Sullivans, the eldest of the Eóganacht Chaisil, were the most powerful lords under them. The O'Keeffes of Eóganacht Glendamnach would later produce many great soldiers for Irish and Continental armies. The O'Callaghans were a smaller sept who have distinguished themselves in recent times, while the MacAuliffes and MacGillycuddys are, as stated, simply septs of the MacCarthys and O'Sullivans. The O'Kirbys of Eóganacht Áine were ruined by the Norman Invasion of Ireland.