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The Church Fathers · c. 595–613
The Letters
Columbanus · c. 543–615
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What it is
Letters to three popes and to his own monks, defending the Irish Easter calculation and addressing the bishop of Rome with startling directness.
Why it lasted
The clearest evidence of a confident Irish church that regarded itself as answerable to Rome in charity but not in custom.
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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