Manuscripts
Manuscript:
Brussels, Bibliothèque Royale de Belgique, MS 5413-5422
  • s. ix–x
Not yet published
Ó Cróinín, Dáibhí, “A seventh-century Irish computus from the circle of Cummianus”, Proceedings of the Royal Irish Academy 82 C (1982): 405–430.  
abstract:
The Letter of Cummian on the Paschal question (c. A.D. 632) has long been recognised as one of the primary historical documents of the early Irish churches. The purpose of this paper is to show that a computus in Brussels, Bibliothèque royale, MS 5413-22, is the work either of Cummian himself or of a member of his immediate circle, and therefore represents an important new witness to the state of scientific learning in seventh-century Ireland.