Domnall mac Cathail (died 715)all dates per The Chronology of the Irish Annals, Daniel P. McCarthy was a possible King of Connacht from the Uí Briúin branch of the Connachta. He was the son of Cathal mac Rogallaig (died 680) and grandson of a previous king Rogallach mac Uatach (died 649).Francis J.Byrne, Irish Kings and High-Kings, Table 20
Though listed in king-listssuch as Book of Leinster, Section 30 and Laud Synchronisms he is omitted from the annals as king except for the Chronicum Scotorum which mention him as king of Connacht at his death obit in 715. He would have acceded to the throne in 707 upon the slaying of Indrechtach mac Dúnchado Muirisci (died 707) by the northern Ui Neill.Byrne assigns the period after 707 to the reign of Indrechtach mac Muiredaig Muillethan (died 723), pg.248
Notes
See also Kings of Connacht
References
Chronicum Scotorum Francis J.Byrne, Irish Kings and High-Kings Laud Synchronisms Book of Leinster, Section 30 The Chronology of the Irish Annals, Daniel P. McCarthy
External links CELT: Corpus of Electronic Texts at University College Cork