Uí Thairdelbaig came O'Brien, O'Kennedy (who were Kings of Ormond), MacConsidine, MacMahon, O'Reagan, MacLysaght, O'Kelleher, Boland, Cramer, Kearney, O'Casey, Power, Twomey, Eustace, Ahearne, MacGrath, Quick, O'Meara, Scanlan, MacArthur, Cosgrave, O'Hogan, Lonergan and others. O'Noonan and Coombe are other notable Uí Bloid descendants. A younger brother of Carthann Fionn (who both the Uí Thairdelbaig and Uí Aengusa derive) named Brennan Ban stands at the head of the genealogies for the O'Brennan, Glinn, Muldowney and O'Hurley septs. Although a junior line, the Uí Caisin continued to have a prominent role and the leader of their kindred in Thomond were the MacNamara, who as Lords of Clancullen, were the second most powerful family after the O'Brien. Other families descended from the branch of Carthann (son of Caisin) include Harley, Flood, Torrens, Stoney, Hickey, O'Hay, Clancy, Neylon and Flattery. Carthann had brothers named Eocha and Sineall from whom descend the O'Grady, Tubridy, Hartigan, Durkin, Killeen and Hogg. In addition to this, there are the Ui Fearmaic who claim to descend from Aengus Cinathrach, a brother of Caisin and Bloid. This kindred included the O'Dea as leaders, as well as the O'Quin, O'Griffin / O'Griffey (chieftains of Cineal Cuallachta), O'Heffernan, Kielty and Perkin. Titles and social roles Within the traditional Gaelic culture of Ireland, society rested on the pillars of the tribal nobility, bardic poet historians and priests. Different families had different roles to play and in many cases, this was a hereditary role. However, the nature of this system, known as tanistry was aristocratic ("rule by the best") in the truest sense, in that if the tribe thought a younger male member of the family was more suitable to succeed to a role than an older sibling, then they could. The Norman and wider European concept of strict primogeniture was not completely adopted until after some of the families joined the peerage of Ireland. The most powerful Dalcassian family of the hereditary Gaelic nobility were the O'Brien (Kings of Thomond), followed by MacNamara (Lords of Clann Cuilean), O'Kennedy (Kings of Ormond), MacMahon (Lords of Corca Baiscinn), O'Grady (Lords of Cinél Dongaile) and O'Dea (Lords of Ui Fearmaic). Some of these families later joined the peerage of Ireland after the surrender and regrant to the Tudors during the 16th century. The O'Brien was initially Earls of Thomond, but later became Barons Inchiquin which they hold to this day. The O'Grady was Viscounts Guillamore, while the