Bécc Bairrche mac Blathmaic (died 718)[1] was king of Ulaid from 692 to 707 from the Dál Fiatach clan.
[5] He, however, did not acquire the Ulaid throne until after the death of Fergus mac Áedáin of the rival Uí Echach Cobo branch of the Dal nAraide in 692 who may have been a compromise candidate.
[6] The High King of Ireland Fínsnechta Fledach of the Síl nÁedo Sláine may have been married to the daughter of Congal named Conchenn and may have had some personal antagonism towards Bécc.
The offensive was struck by Bécc who penetrated into southern Ui Neill territory only to be defeated by the high king at Tailltin in 679.
[7] Bécc was also married to Conchenn ingen Congaile probably after the death of Fínsnechta in order to bolster his position in Ulaid.