As the Bishop of Rome, the pope, papa in Latin, holds the highest authority in the Roman Catholic Church. One of the many ways that the Holy Father teaches or encourages is through letters; constitutions, bulls, exhortations, encyclicals or motu proprios.

These letters can be found on the https://www.vatican.va Vatican website, where they are managed by the Dicastery for Communication, Vatican Library and Vatican Internet Services.

Most Vatican website documents are compatible with mobile device reading, but some archived documents follow antiquated web standards. Documents can be hard to find. You need to know the name of the pope who wrote or promulgated the document, and the latin name of the document.

This website indexes all papal documents and provides easy searching.

The documents are minimally reformatted for easy use on mobile devices. Minimal cleanup is donea. No content is ever removed. All data is directly sourced from the Vatican website. You are always viewing the most current original Vatican website text.

This project started with the Vatican II documents.

Hierarchy of Papal Documents by Authority

The Church recognizes a general ordering, which follows below.

Highest Authority — Solemn / Legislative Documents

Apostolic Constitution

Primary Purpose: Define dogma / fundamental law
Authority Level: Highest (can be infallible)

The most solemn and authoritative document a pope can issue. Used to define dogmas of faith, promulgate fundamental Church laws, or reorganize major structures. It demands the highest degree of assent. Examples: Munificentissimus Deus (1950, defining the dogma of the Assumption) and Pastor Bonus (1988, reorganizing the Roman Curia).

Papal Bull
A bull isn't necesarily a separate authority level — historically it refers to the form of a solemn document, authenticated with a lead seal (bulla). Apostolic constitutions are often issued as bulls. It carries very high solemnity (e.g., proclaiming Jubilee years, canonizations, erecting dioceses).

Ordinary Magisterium — Teaching Documents

Encyclical

Primary Purpose: Teach on faith, morals, social doctrine
Authority Level: High (ordinary magisterium)

Encyclical is simply another word for circular letter. A solemn letter, usually addressed to the bishops of the whole world and, through them, to all the faithful. Its purpose is to teach (not legislate) on faith, morals, or social doctrine. Though not infallible in themselves, they carry considerable weight and require a "religious assent of intellect and will." Examples: Rerum Novarum, Humanae Vitae, Laudato Si'.

Apostolic Exhortation

Primary Purpose: Pastoral encouragement, post-synod
Authority Level: Moderate-high

More pastoral than doctrinal. Frequently publishes the conclusions of a Synod of Bishops or promotes a particular spiritual or missionary orientation. It proposes practical applications of doctrine rather than defining it. Examples: Evangelii Gaudium, Amoris Laetitia, Evangelii Nuntiandi.

Apostolic Letter

Primary Purpose: Specific doctrinal/pastoral topics
Authority Level: Moderate

A flexible instrument for addressing specific doctrinal, pastoral, disciplinary, or commemorative matters — without the solemnity of an encyclical. Often personal or exhortative in tone. Example: Novo Millennio Ineunte.

Governance / Administrative Documents

Motu Proprio

Primary Purpose: Governance, discipline, law changes
Authority Level: Legal/administrative

Latin for "on his own initiative" — a document issued personally by the pope, without external prompting. Typically used for administrative or disciplinary matters, and can modify aspects of Canon Law or establish new norms. Example: Benedict XVI's motu proprio approving the Compendium of the Catechism.

Other / Lesser Instruments

Primary Purpose: Application & pastoral guidance
Authority Level: Lowest binding weight

Declarations
Often associated with councils (like Vatican II) or curial offices acting with papal approval.

Decrees
A law issued by a superior authority and legislated by Canon law. Canon law offers the following definition:

Canon 29 General decrees, by which a competent legislator issues common prescripts for a community capable of receiving law, are laws properly speaking and are governed by the prescripts of the canons on laws.

Instructions
issued by Vatican Dicasteries with the pope's approval, explaining how to apply existing laws or documents.

Letters
the least formal, offering pastoral or occasional teaching that deserves respect but carries the lowest binding weight.

Messages
the least formal, offering pastoral or occasional teaching that deserves respect but carries the lowest binding weight.

Homilies
the least formal, offering pastoral or occasional teaching that deserves respect but carries the lowest binding weight.

Angelus/Audience addresses
the least formal, offering pastoral or occasional teaching that deserves respect but carries the lowest binding weight.

The type of document isn't the sole determinant of authority — what matters most is the content and the intent to teach. A single document can contain passages at different levels of authority (from infallible dogma down to prudential guidance). Authority follows content, not just category. A pope's homily can restate infallible dogma, while an apostolic constitution can contain routine administrative provisions.

Promulgation
Formal legal act, making the law binding by publicizing it. Canon law puts it simply as:

Canon 7 A law is established when it is promulgated.

Proclamation
Formal public communication from the Holy Father regarding a decision, teaching or law. Used to define doctrine, call for special periods like a Jubilee year, or address moral and social issues.