Tadhg Caech Ó Cellaigh was a King of Ui Maine within Ireland, who retired in 1476.
Upon the death of Aedh na gCailleach Ó Cellaigh in 1469, the Ui Maine elected two kings, ruling Iar Ui Maine (west) and Airthir Ui Maine (east) respectively. They were Tadhg Caech Ó Cellaigh of Airthir, and William Ó Cellaigh in the west. Upon the retirement of Tadhg in 1476, Uilliam became king of all Ui Maine, installing his brother, Donnchadh, as tánaiste in Airthir.
See also Kings of Uí Maine
References
The Tribes and customs of Hy-Many, John O'Donovan, 1843 The Parish of Ballinasloe, Fr. Jerome A. Fahey. The Surnames of Ireland, Edward MacLysaght, Dublin, 1978. A New History of Ireland - lists and genealogies, vol. 9, Oxford University Press, 1984. Dictionary of Irish Biography, pp. 592–94, Cambridge, 2010 Annals of Ulster at CELT: Corpus of Electronic Texts at University College Cork Annals of Tigernach at CELT: Corpus of Electronic Texts at University College Cork Revised edition of McCarthy's synchronisms at Trinity College Dublin. https://web.archive.org/web/20070711171122/http://www.chivalricorders.org/nobility/holyroman/hrebrit.htm http://www.stirnet.com/main/index.php?option=com_wrapper&Itemid=79&startUrl=http://www.stirnet.com/HTML/genie/british/kk/kelly01.htm