The battle appears as an entry in a number of the Irish annals: namely, "Annals of the Four Masters", the "Annals of Ulster", the "Chronicon Scotorum" and the "Annals of Innisfallen". The Irish annals "constitute a substantial and unique collection of annual records of ecclesiastical and political events", as written in the Irish monasteries from the mid-6th century to the end of the 16th century. Although the historical status of the retrospective entries on the pre-Christian and early Christian periods are uncertain, entries from the later 6th century on are contemporaneous. Collation of the annals has provided a reliable chronology for events in medieval Ireland.