9De Vismes Kane, William F. M. "The Black Pig's Dyke: The Ancient Boundary Fortification of Uladh." Proceedings of the Royal Irish Academy. Section C: Archaeology, Celtic Studies, History, Linguistics, Literature 27 (1908-1909): 321.
To provide a dating framework for the Dyke, Kane largely relied on annalistic evidence: "But since the new frontier of Ulster was fixed during the reign of Tuathal Teachtmar, i.e. A.D. 130 160, the trench cannot have been made earlier ; and, on the other hand, this defensive boundary must have been put up before 332, when the destruction of Emania, and the overthrow of the Ultonian dynasty after 600 years' duration, were accomplished by the three Collas."