Tuileagna was a member of the Ó Maolconaire Brehon family, but it has proved difficult for researchers to uncover more detail about him.
A later Tuileagna Ó Maol Chonaire added a note to Laud Misc 610 in Oxford, 1673, but his identity is unknown.
In 1637, upon Mícheál Ó Cléirigh's return to Louvain with the finished autograph of the Annals of the Four Masters, Tuileagna publicly expressed concerns on four points of detail in Genalogiae regum et sanctorum Hiberniae and the Four Masters text, stating that the points cast a slur on the status of Connacht.
It is unlikely, though not impossible, that he had many of these manuscripts to hand at the same time as he had access to the text of AFM, but Tuileagna nonetheless felt confident about their contents.
It is noteworthy that Tuileagna also had access to the work of another Franciscan historian, Fláithrí Ó Maol Chonaire, together with the recently completed Foras Feasa ar Éirinn of Geoffrey Keating ...