 There are lacunae in places where the exemplar could no longer be read due to its poor condition.Mac Fhirbhisigh's copyist added dates, which he took from the "Annals of the Four Masters" without troubling to confirm their accuracy or correct them where they were clearly in error.The first fragment relates mainly to the Northern Uí Néill and may have been compiled in Ulster, but the remaining fragments were evidently compiled in Osraige (Ossory), a kingdom which corresponded approximately to the later County Kilkenny and western County Laois.