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The Medieval Church · c. 1230–1245
The Little Summaries of Logic
Summulae Logicales
Peter of Spain · c. 1215–1277
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What it is
A textbook of logic covering the Aristotelian syllogism and then the medieval theory of how terms actually refer in a sentence.
Why it lasted
The standard logic textbook of Europe for three hundred years, running through hundreds of editions — and its author later became pope.
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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