Two sons of Niall Noigiallach, Lóegaire (fl. c. 450) and Coirpre (fl. c. 480), initially led the dynasty. As did their immediate descendants. However, after the murder of Túathal Máelgarb in about 544, it was left to another branch of the family descended from another of Niall's sons – Conall Cremthainne – to continue Uí Néill expansion and consolidate their position. No descendants of either Lugaid mac Lóegairi or Túathal Máelgarb are recorded.[citation needed]
According to A Dictionary of British and Irish History (2020), the "last effective high‐king of the Southern Uí Néill" was Conchobar Ua Máel Sechlainn.[3] A member of the "Clann Cholmáin dynasty of the Uí Néill", he died c. 1073.[4]
O'Flynn, Eoin (2013). "The Dublin Vikings and the Clann Cholmáin kings of the southern Uí Néill". In Duffy, Seán (ed.). Medieval Dublin XIII: proceedings of the Friends of Medieval Dublin Symposium, 2011. Dublin: Four Courts Press. pp. 13–26. ISBN1846823897.
References
^ abPurcell, Emer; Sheehan, John (2013). "Viking Dublin: Enmities, Alliances And The Cold Gleam Of Silver". Everyday Life in Viking-Age Towns: Social Approaches to Towns in England and Ireland, c. 800-1100. Oxbow Books. pp. 35–60. doi:10.2307/j.ctvh1dmk1. The main Southern Uí Néill dynasties were Clann Cholmáin, who ruled the kingdom of Mide, and Síl nÁedo Sláine, who ruled Brega, while their northern cousins were Cenél nEógain and Cenél Conaill
^Downham, Clare (2017). Medieval Ireland. Cambridge University Press. p. 92. ISBN110854794X. [The] Southern Uí Néill [..] were split into two main groups that dominated the east midlands, namely Síl nÁedo Sláine and Clann Cholmáin
^Peberdy, Robert; Waller, Philip, eds. (2020). A Dictionary of British and Irish History. John Wiley & Sons. p. 642. ISBN1119698421. The last effective high‐king of the Southern Uí Néill was Conchobar Ua Máel Sechlainn (ruled 1030–73)