 Barith had been active in Ireland while Amlaíb was still on the throne; he may have participated in Amlaíb's raid on Lismore in 867; also in 867 he narrowly avoided assassination during a raid in Connacht in which a kinsman Háimar was killed, and in 873 he and Oistín had invaded Munster with a fleet of ships.Six years later Vikings plundered Armagh and held the abbot and the lector hostage; Barith may have been behind this raid.Finally, in 881, he sacked the oratory of St Cianán at Damhliag in Brega (Duleek in Meath).