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The Medieval Church · written 1376; widely copied thereafter
The Directory of Inquisitors
Directorium Inquisitorum
Nicholas Eymerich · c. 1316–1399
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What it is
A systematic manual of inquisitorial law and procedure, defining heresy, listing condemned propositions, and prescribing the conduct of trials.
Why it lasted
Catalogued because it must be known: the standard inquisitorial handbook for four centuries, later reissued for the Spanish and Roman tribunals.
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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