¹³⁹Petrie, George. "On the History and Antiquities of Tara Hill." The Transactions of the Royal Irish Academy, vol. 18, 1839, p. 140.
"There are two mounds north of the Cubhat called Dall and Dorcha, Dall towards the south, Dorcha towards the west, and these [i.e. the persons interred under them] slew each other. And there is no wall between them, and the stones and the Cubhat."

"The monuments next noticed in the prose account, as being in the immediate vicinity of the Grave of the Dwarf, and north of the Rath of the Synods, are the mounds called Dall and Dorcha the tombs of the two blind mendicants so named,who slew each other. The accounts of the situation of these monuments, as given both in the prose and verse, are very indistinct ; the prose, as given in most copies, states, that they were to the north of the Dwarf's Grave, Dail towards the south, and Dorcha towards the west ; or, as given in the Book of Glendalough, Dall the name of the western mound, and Dorcha the name of the eastern. From the indistinctness and apparent contradiction in these accounts, it is not possible to assign, with any degree of certainty, the proper names to the two mounds, which still remain to the north and north-west of the Rath of the Synods ; but there can be but little doubt that they are the mounds alluded to, as otherwise they would be unnoticed features in all the descriptions." (p. 184)