The chronology and sources of the early Irish annals

Chronological divergence between the different early Irish annals has hampered the use of their many unique records of events in Ireland, Britain and the European continent as historical sources. This paper reviews recent work which has demonstrated that their original chronological apparatus consisted of a kalend (Kł) followed, until at least the mid-seventh century, by the ferial of 1 January, and from this a consistent chronology has been restored for the annals over the years AD 1–722. In addition, critical examination of their regnal and episcopal successions has established that the 'world history' section of these annals and Bede's Chronica maiora are not mutually dependent, but rather share a common source which has been identified as a kalend-plus-ferial chronicle composed by Rufinus of Aquileia in the early fifth century.