Among his know surviving works is Crann seoil na cruinne an chroch naomtha (The holy cross is the mast of the world) and a lament of one hundred verses on the death of King of Uí Failghe, Brian mac Cathaoir Ó Conchubhair Fáilghe (reigned c. 1525-c. 1556).
A third poem - Cia re ccuirfinn sed suirghe - in praise of Manus mac Aodh Dubh Ó Domhnaill is ascribed to him.
He appears to be the same man that Captain Francis O'Neill, apparently incorrectly, associates with Geoffrey Keating (c.1569-1643).
By whom the anguish of the envenomed spear’s recent would is healed, through the sweet-voiced sound of the sounding-board, like the sweet~streamed peal of the organ?
Tadhg O’Cobthaigh of beauteous form, - The chief-beguiler of women, The intelligent concordance of all difficult tunes, The thrills of music and of harmony.