Comyn's poem was almost certainly based on earlier traditional sources, either oral or written or both, but these have not hitherto been discovered.
_The History of King Cormac_.

The story of the birth of Cormac and his coming into his kingdom is to be found in SILVA GADELICA, where it is edited from THE BOOK OF BALLYMOTE, an MS.

dating from about the year 1400.
The charming tale, of his marriage with Ethne ni Dunlaing is taken from Keating's FORUS FEASA.

From this source also I have taken the tales of the Brehon Flahari, of Kiernit and the mill, and of Cormac's death and burial.

The _Instructions of Cormac_ have been edited and translated by Dr Kuno Meyer in the Todd Lecture Series of the Royal Irish Academy, xiv., April 1909.