Giolla na Naomh Mac Aodhagáin, Irish scribe and historian, died c. 1443.
He was responsible for the compilation of the Fragmentary Annals of Ireland, which he wrote on a vellum manuscript.
The original manuscript is now lost but a copy survives of Mac Fhirbhisigh's text.
In 1309, a direct ancestor with the same name, Giolla na Naomh Mac Aodhagáin ollav of Connacht in Law and a universal master equally skilled in all arts, was killed in the retinue of Aedh mac Eoghain Ó Conchobair king of Connacht by the Clan Murtagh O'Conor.
The Mac Aodhagáin family moved south from Connacht into Ormond after his death.