Fiachnae's death in 626, at the hands of his namesake, Fiachnae mac Demmáin of the Dál Fiatach, and the second Fiachnae's death a year later in battle against the Dál Riata probably eased the way for Edwin's conquests in the Irish sea province.
A morte de Fiachnae no ano 626, a mans do seu homónimo, Fiachnae mac Demmáin dos Dál Fiatach, e a morte deste un ano despois na batalla contra Dalriada, probabelmente facilitaron a Edwin as súas conquistas na provincia marítima de Irlanda.