1303.
Ó Cróinín (Dáibhí): Early Irish annals from Easter tables: a case restated.
In Peritia 2 (1983), pp. 74–86.
Argues that marginal notes were added to Easter tables in Ireland from the sixth century and that this practise was widespread by the mid-seventh century; the earliest Irish chronicle was compiled from these notes in the mid-eighth century.

Repr. in D. Ó Cróinín, Early Irish history and chronology, pp. 76-86.

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