Máine Mór descended from Colla da Chrioch of Oirghialla/Oriel, which became overpopulated. Máine Mór, his father Eochaidh Ferdaghiall and his two sons Breasal and Amhlaibh, travelled to Connacht to seek new lands. They attacked the lands of the local king, Cian d'Fhearaibh Bolg, king of the Fir Bolg (see Soghain and Senchineoil), and with the intervention of Grellan, settled in the land. In return, the Uí Maine would evermore pay tribute to Grellan, who became the dynasty's patron saint.
He was succeeded by his surviving son, Breasal mac Maine Mór, who ruled for thirty years.
- Tadhg Mór Ua Cellaigh (d. 1014), the first O'Kelly
- Madudan Reamhar Ua Madadhan, Chief of Síol Anmchadha, 1069-1096
- Gillafin mac Coulahan lord of Síol Anmchadha, 1096-1101
- Seán Ó Maolalaidh (fl. 1419–1480), Chief of the Name
- Feardorcha Ó Cellaigh, 68th and last king of Uí Maine, 43rd Chief of the Name, fl. 1584-after 1611
- Samuel Madden (1686-1765), author
- Thomas Arthur, comte de Lally, baron de Tollendal (January 1702 – 1766), French general
- Thomas J. Kelly (Irish nationalist) (d. 1908), Irish revolutionary and USA soldier
- Arthur Colahan (died 1952), composer of the song "Galway Bay"
- Mian Kelly, model, 1898-1973
- Albert Naughton (fl. 1953), Great Britain rugby league player
- Martin Naughton (hurler) (born 1956), Galway hurler
- Joe Steve O Neachtain, Irish actor and playwright
- Samuel Madden (MIT) (born 1976), computer scientist
- Liam Madden, a leader of Iraq Veterans Against the War
- Kings of Uí Maine, c.450-after 1611
| King of Uí Maine
c. 357?– c. 407?
Breasal mac Maine Mór
- 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.
- Irish Kings and High-Kings, Francis John Byrne, Dublin (1971;2003) Four Courts Press, ISBN 978-1-85182-196-9
- History of the O'Maddens of Hy-Many, Gerard Madden, 2004. ISBN 0-9529511-7-7.
- The Life, Legends and Legacy of Saint Kerrill: A Fifth-Century East Galway Evangelist by Joseph Mannion, 2004. ISBN 0-9547698-1-3
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