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The Medieval Church · c. 1271–1276
The Mirror of Judgement
Speculum Iudiciale
William Durandus · c. 1230–1296
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What it is
A complete manual of judicial procedure — summons, evidence, witnesses, appeals — for church courts, which by then handled marriage, wills, and much else.
Why it lasted
The standard procedural handbook of European courts for three centuries, and a foundation of the civil law tradition.
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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