Manuscripts
Manuscript:
Cologne, Erzbischöfliche Diözesan- und Dombibliothek, MS 102
No catalogue entry available
Sayers, William, “Irish affinities of De tonitruis, a treatise of prognostication by thunder”, Eolas: The Journal of the American Society of Irish Medieval Studies 10 (2017): 2–15.  
abstract:

Five newly edited manuscripts reveal that the treatise De tonitruis purports to be adapted from the Irish language. In this essay, possible Irish affinities are explored and are found to lie, in increasing order of importance, in the ornate prose style, the recondite and culturally highly significant vocabulary, and the eulogistic citations of unnamed natural philosophers as authorities for thunder prognostics. In all these respects, De tonitruis differs from conventional European brontologies. Although it is surely not translated from the Irish language, the mark of Irish learning is distinctive.

Juste, David, and Hilbert Chiu, “The De tonitruis attributed to Bede: an early medieval treatise on divination by thunder translated from Irish”, Traditio 68 (2013): 97–124.  
abstract:
The De tonitruis (or De tonitruis libellus ad Herefridum) attributed to Bede is a short text containing a prologue and four chapters dealing with the meaning of thunder heard (I) in each of the four cardinal directions, (II) in each of the twelve months of the year, (III) on each of the seven days of the week, and (IV) at certain hours of the day and of the night. The text was first published among Bede's works by Noviomagus in Cologne in 1537 and was subsequently reprinted in all editions of the complete works of Bede, including Migne's Patrologia Latina. Charles W. Jones, who was the first to discuss the De tonitruis in detail, convincingly dismissed the attribution to Bede and identified what he thought to be the only extant MS (and also the exemplar used by Noviomagus): Cologne, Erzbischöfliche Diözesan- und Dombibliothek, 102, fols. 49r–52v, copied in Cologne in the first half of the eleventh century.

Results for C (1289)
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 6
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 8
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 11
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 20
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 114B
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 306B
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 307B
  • Aberystwyth, National Library of Wales, Cwrtmawr MS 314