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The Medieval Church · c. 1081–1083
The Collection of Canons
Anselm of Lucca · 1036–1086
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What it is
A canon law collection assembled to support the reform papacy, with a book on the lawful use of force against schismatics that had no real precedent.
Why it lasted
It supplied the canonical arguments that made holy war thinkable in the Latin West a decade before the First Crusade.
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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