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A papal bull is a particular type of letters patent or charter issued by a Pope of the Roman Catholic Church. It is named after the lead seal that was appended to the end in order to authenticate it.

Papal bull of Pope Urban VIII, 1637, sealed with a lead bulla.
The Apostolic constitution Magni aestimamus issued as a Papal bull by Pope Benedict XVI in 2011 which instituted the Military Ordinariate of Bosnia and Herzegovina

A papal bull is a particular type of letters patent or charter issued by a Pope of the Roman Catholic Church. It is named after the lead seal (bulla) that was appended to the end in order to authenticate it.