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The Medieval Church · c. 1188–1190
Summa on the Decretum
Huguccio of Pisa · d. 1210
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What it is
The most detailed commentary on Gratian, ranging over marriage, papal power, and whether a pope who falls into heresy may be judged by the church.
Why it lasted
The high point of the decretist school, and its discussion of a heretical pope was still being cited during the Great Schism two centuries later.
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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