GIA4740103 Seal dating from the time of Pope Boniface VIII (Benedetto Caetani dit Bonifacio VIII, 1230-1303). This piece of lead, also called ???ubble?? was used to seal the papal writings (hence the name ???ontifical bubble??given to these writings). The two faces above symbolize the apostles Peter and Paul. Milan, National Archive. by Unknown Artist, (13th century); Archivio di Stato, Milan, Italy; (add.info.: Seal dating from the time of Pope Boniface VIII (Benedetto Caetani dit Bonifacio VIII, 1230-1303). This piece of lead, also called ???ubble?? was used to seal the papal writings (hence the name ???ontifical bubble??given to these writings). The two faces above symbolize the apostles Peter and Paul. Milan, National Archive.); by Giancarlo Costa; out of copyright.