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The Church Fathers · c. 632–633
Letter on the Paschal Controversy
Cummian · 7th century
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What it is
An Irish abbot explains why, after a year shut in with the computistical texts, he has abandoned the Irish Easter reckoning for the Roman one.
Why it lasted
The best surviving record of how a scholarly argument about the calendar was actually conducted, and of what an Irish monastic library held.
Where to read it
Public domain and free to read in full, though not held here. The archives below have it.
These open a search on each archive rather than a direct link, which is the honest way to point at an edition nobody here has checked line by line.
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