Mac Cú Ceanain
A son of Cú Ceanain mac Tadhg, first name unknown, is noted as king of Uí Díarmata at his death in 1021. His father, though never king himself, had died fighting against the then king in a succession war in 991. From the reign of his son, became the ancestor of all subsequent kings, and the dynasty took their surname, O Concannon, from him.
Muirgheas mac Aedh
| King of Uí Díarmata
Muirgeas ua Cú Ceanainn
- The Tribes and Customs of Hy-Many, John O'Donovan, 1843
- The Parish of Ballinasloe, Fr. Jerome A. Fahey.
- Vol. 2 (AD 903–1171): edition and translation
- 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..