A papal bull is a type of public decree, letters patent, or charter issued by the pope of the Catholic Church. It is named after the leaden seal traditionally appended to authenticate it.
A 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
Printed text of Pope Leo X's Exsurge Domine, issued in June 1520. The Latin printed text reads: Bulla contra Errores Martini Lutheri et sequacium (lit. 'Bull against the errors of Martin Luther and his followers')
A lead bulla (obverse and reverse) of Gregory IX, pope 1227 to 1241