Flaithbertach is first mentioned by the Irish annals in 907, when he is recorded, along with the then-King of Munster Cormac mac Cuilennáin, leading an expedition by the Munstermen against Connacht and the Uí Néill.
Cormac mac Cuilennáin of the Eóganachta of Cashel, King of Munster, with his "evil genius" and later successor Flaithbertach mac Inmainén by his side, raided Connaught and Leinster in retaliation and, according to some annals, defeated Flann.
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