 Mac Aodhagáin, who died around 1443, was a professor of Irish Brehon Law in Ormond.The sole surviving manuscript of the "Fragmentary Annals", which is currently held by the Royal Library of Belgium in Brussels, is not in Mac Fhirbhisigh's hand, but in that of an anonymous scribe, who made a fair copy of Mac Fhirbhisigh's text, adding some marginal comments of his own and an index.The manuscript (MS. 7, c. n. 17) is incomplete and includes five fragments of annals beginning in 573 and ending in 914.