His obit is given in the Annals of the Four Masters as follows- "M1119.10 Cucollchoille Ua Baigheallain, chief ollamh of Ireland in poetry, a man distinguished for charity, hospitality, and universal benevolence towards the needy and the mighty, was killed by the men of Lurg and Tuath-ratha (Barony of Lurg and Tooragh, County Fermanagh), with his wife and two very good sons, and also five-and-thirty other persons, consisting both of his family and guests, in one house, on the Saturday before Little Easter, being the festival of Becan, son of Cula."
His obit is given in the Annals of Ulster as follows- "U1119.3 Cú Collchaille ua Baighellán, chief ollav of Ireland in poetry, alms, honour and general compassion to weak and strong, was killed by the men of Lurg and Tuath Rátha, with his wife and two sufficiently good sons, and with thirty-five others, both household and guests, in one house on Low Saturday 5 April, the feast of Bácán son of Cula."
Ua Baígilláin, royal poet of Ireland, was killed by the Tuath Rátha, by Spaillech Ó Flannagáin."
His obit is given in the Annals of Inisfallen as follows- "AI1119.2 The violent death of the poet Ua Baígelláin together with his two sons, his wife, and his train.
His obit is given in the Annals of Loch Cé as follows- "LC1119.3 Cúchollchaille O'Baighelláin, chief ollamh of Erinn in poetry, and a man distinguished for charity and hospitality, and for universal benevolence towards the needy and the powerful, was slain by the Feara-Luirg and Tuath-ratha, cum sua uxore et duobus filiis suis bonis, et cum xxxv.