A seal or official stamp, especially one used on royal documents or papal decrees in medieval times.
From Latin 'bulla' meaning bubble or round seal; the term refers to the leaden seals attached to important official documents.
Medieval kings and popes couldn't sign their names on every document, so they created distinctive metal seals—a 'bul' was like the original hologram of authenticity, proving a letter came from the real deal.
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