A papal bull is a particular type of letters patent or charter issued by a Pope of the Catholic Church. It is named after the lead seal (bulla) that was appended to the end in order to authenticate it.
Papal bulls have been in use at least since the 6th century, but the term was not used until around the end of the 13th century, and then only internally for unofficial administrative purposes. However, it had become official by the 15th century, when one of the offices of the Papal chancery was named the "register of bulls" (registrum bullarum).
By the accession of Leo IX in 1048, there develops a clear distinction between two classes of bulls of greater and less solemnity. The majority of the "great bulls" now in existence are in the nature of confirmations of property or charters of protection accorded to monasteries and religious institutions. At an epoch when there was much fabrication of such documents, those who procured bulls from Rome wished to secure that the authenticity of their bulls should be above suspicion. A papal confirmation, under certain conditions, could be pleaded as itself constituting sufficient evidence of title in cases where the original deed had been lost or destroyed.
Since the 12th century, papal bulls have carried a lead seal with the heads of the apostles Saint Peter and Saint Paul on one side and the pope’s name on the other. Papal bulls were originally issued by the pope for many kinds of communication of a public nature, but by the 13th century, papal bulls were only used for the most formal or solemn of occasions. Papyrus seems to have been used almost uniformly as the material for these official documents until the early years of the eleventh century, after which it was rapidly superseded by a rough kind of parchment.
Modern scholars have retroactively used the term "bull" to describe any elaborate papal document issued in the form of a decree or privilege (solemn or simple), and to some less elaborate ones issued in the form of a letter. Popularly, the name is used for any papal document that contains a metal seal.
Today, the bull is the only written communication in which the Pope will refer to himself as episcopus servus servorum Dei, meaning "Bishop, Servant of the Servants of God." For example, when Benedict XVI, issued a decree in bull form, he began the document with Benedictus, Episcopus, Servus Servorum Dei. While it used to always bear a metal seal, it now does so only on the most solemn occasions. It is today the most formal type of letters patent issued by the Vatican Chancery in the name of the Pope.
A bull's format began with one line in tall elongated letters containing three elements: the Pope's name, the Papal title episcopus servus servorum Dei, meaning 'bishop, servant of the servants of God', and the few Latin words that constituted the incipit from which the bull would also take its name for record keeping purposes, but which might not be directly indicative of the bull's purpose.
The body of the text had no specific conventions for its formatting; it was often very simple in layout. The closing section consisted of a short datum, mentioning the place it was issued, the day of the month and the year of the pope's pontificate and signatures, near which was attached the seal.
For the most solemn bulls, the Pope would sign the document himself, in which case he used the formula Ego N. Catholicae Ecclesiae Episcopus (I, N., Bishop of the Catholic Church). Following the signature in this case would be an elaborate monogram, the signatures of any witnesses, and then the seal. Nowadays, a member of the Roman Curia signs the document on behalf of the Pope, usually the Cardinal Secretary of State, and thus the monogram is omitted.
The most distinctive characteristic of a bull was the metal seal (bulla), which was usually made of lead, but on very solemn occasions was made of gold (as those on Byzantine imperial instruments often were: see Golden Bull). On the obverse it depicted (originally somewhat crudely) the early fathers of the Church of Rome, the apostles Peter and Paul, identified by the letters Sanctus PAulus and Sanctus PEtrus (thus, SPA •SPE or SPASPE). Paul, on the left, was shown with flowing hair and long pointed beard composed of curved lines, while Peter, on the right, was shown with curly hair and shorter beard made of dome-shaped globetti (beads in relief). Each head was surrounded by a circle of globetti, and the rim of the seal was surrounded by an additional ring of such beads, while the heads themselves were separated by a depiction of a cross. On the reverse was the name of the issuing pope in the nominative Latin form. This disc was then attached to the document either by cords of hemp (in the case of letters of justice, and executory) or by red and yellow silk (in the case of letters of grace) that was looped through slits in the vellum of the document. The term bulla derives from the Latin bullire, "to boil", and alludes to the fact that, whether of wax, lead, or gold, the material making the seal had to be melted to soften it and take on an impression.
In 1535 the Florentine engraver Benvenuto Cellini was paid 50 scutes to recreate the metal matrix which would be used to impress the lead bullae of the Pope Paul III. Cellini retained definitive iconographic items like the faces of the two apostles, but he carved them with a much greater attention to detail and artistic sensibility than had previously been in evidence. On the reverse of the seal he added several fleurs-de-lis, a heraldic device of the Farnese family, from which Pope Paul III had come.
Since the late 18th century, the lead bulla has been replaced with a red ink stamp of Saints Peter and Paul with the reigning Pope's name encircling the picture, though very formal letters, e.g. the bull of Pope John XXIII convoking the Second Vatican Council, still receive the lead seal.
Original papal bulls exist in quantity only after the 11th century onward, when the transition from fragile papyrus to the more durable parchment was made. None survives in entirety from before 819. Some original lead bullae, however, still survive from as early as the 6th century.
In terms of content, the bull is simply the format in which a decree of the Pope appears. Any subject may be treated in a bull, and many were and are, including statutory decrees, episcopal appointments, dispensations, excommunications, apostolic constitutions, canonizations and convocations.
The bull was the exclusive letter format from the Vatican until the 14th century, when the papal brief began to appear. The brief is the less formal form of papal communication and is authenticated with a wax impression (now a red ink impression) of the Ring of the Fisherman. There has never been an exact distinction of usage between a bull and a brief, but nowadays most letters, including encyclicals, are issued as briefs.
- Bull of the Crusade
- Canonical Coronation
- Golden Bull
- Great Seal of the Realm
- Letters Patent
- Rota (papal signature)
- Chambers, Ephraim. Cyclopaedia, or an Universal Dictionary of Arts and Sciences, 1728
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- Albert, C.S. “Bull.” Lutheran Cyclopedia. New York: Scribner, 1899. p. 67
- Papal Encyclicals Online
- List of Conciliar documents at the Theology Library
- Cherubini Laertius: Magnum Bullarium Romanum