Rogallach mac Uatach (died 649) [1] was a king of Connacht from the Uí Briúin branch of the Connachta.
[3] He acquired the throne of Connacht after defeating the previous king Colmán mac Cobthaig (d. 622) of the Ui Fiachrach Aidhne, who was slain at the Battle of Cennbag (Cambo, County Roscommon) in 622.
Professor Francis Byrne believes he is the first reasonable representative of this branch to be said to have held the throne of Connacht[4] According to Geoffrey Keating, Rogallach killed his brother's son treacherously at a meeting of whom he feared might demand the succession.
He also developed an incestuous relationship with his daughter much to the dismay of his wife Muireann (of the Cenél Coirpri) who complained to the high king.
[5] His actual killer recorded in the Annals of Tigernach was Máel Brigte mac Mothlachán of the Corco Cullu who were a subject tribe of the Ciarraige who were still the major population group in the Mag nAí, the home territory of the Ui Briun.