English: Cast lead alloy cut half papal bulla probably of Alexander IV (1254-61). On the obverse are Saint Peter and Saint Paul beneath an inscription reading [SPAS]PE, an abbreviation for St. Paul and St. Peter. St. Paul would have been on the missing half, depicted with a long pointed beard. Peter is on the right facing left and has a rounded face with beard and hair formed of pellets. The face is contained within beaded border.

On the reverse are the letters XAN//PP. This example has been examined by Dr Tim Pestell (Curator of Norwich Castle Museum and ArtGallery) who believes that it is a bulla of Alexander IV inscribed with ALE/XANDER to have the initial X at the start of the second line. There is a hole at the centre of the bulla along where the object has been torn in half. This is known from other bulla however the reason is unknown. It possibly occurred if the object was pinned to a church door which was certainly done with items brought back from pilgrimages.

The papal bulla is a formal seal of office used by the Popes to stamp and authenticate documents produced by the papal curia. Dr Tim Pestell has commented: "Papal bulls came as two basic types, according to the contents of the document: Tituli, or "Letters of Grace", essentially granted or confirmed rights, conferred benefices or promulgated statutes. They generally had their lead bullae attached with cords of silk. Mandamenta, or "Letters of Justice" were mandates that conveyed papal orders, prohibitions or injunctions, and had their bullae attached by hemp threads".