Kelley's "The Ancestry of Eve of Leinster" (The Genealogist, 1980) X:10.
"He is mistakenly called Dunlang in the Three Fragments. Most of the later sources insert Diarmait as son of Dungal and father of Cerball, but the earlier sources have it as shown." His parentage is doubtful. There is some reason to believe that he belong to an altogether different dynasty than FERGAL.