A published collection or register of papal bulls (official papal documents); an archive or index of papal decrees.
Medieval Latin 'bullarium,' from 'bulla' (a papal seal or sealed document) plus the Latin neuter suffix '-arium' (place or collection).
The 'Bullarium Romanum' is a real, massive multi-volume collection of papal documents—what started as a practical need to organize seals and documents became one of history's most important archives, showing how bureaucracy itself shapes what survives!
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