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The Medieval Church · c. 1195–1197
On the Sacred Mystery of the Altar
De Sacro Altaris Mysterio
Innocent III · 1160/61–1216
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What it is
A detailed commentary on the mass, its vestments and gestures, written before its author's election and used as an authority long after.
Why it lasted
The most influential papal treatment of the eucharist before the Fourth Lateran Council defined transubstantiation.
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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