Holy orders in the Catholic Church

Vatican City, officially the Vatican City State (Italian: Stato della Città del Vaticano; Latin: Status Civitatis Vaticanae), often shortened as the Vatican, is a landlocked sovereign city-state. Ruled by the pope, it is an enclave within Rome and serves as the administrative centre of the Catholic Church. Vatican City is governed by the See of Rome, commonly known as the Holy See, itself a sovereign entity under international law, which maintains its temporal power, governance, diplomacy, and spiritual independence. Vatican is also used as a metonym for the Holy See, which is the central governing body of the Catholic Church and Vatican City, comprising the pope and the Roman Curia. The independent state of Vatican City came into existence in 1929 via the Lateran Treaty between the Holy See and the Kingdom of Italy, which spoke of it as a new creation, not as a vestige of the much larger Papal States (756–1870), which had previously encompassed much of Central Italy.

With an area of 48.99 hectares (121 acres) and a population of about 882 in 2024, it is the smallest sovereign state in the world both by area and by population. It is among the least populated capitals in the world. As governed by the Holy See, Vatican City State is an ecclesiastical or sacerdotal-monarchical state ruled by the pope, who is the bishop of Rome and head of the Catholic Church; the highest state functionaries are all Catholic clergy of various origins. The Holy See dates to early Christianity and is the principal episcopal see of the Catholic Church, which in 2018 had about 1.329 billion baptized Catholics in the world, in the Latin Church and 23 Eastern Catholic Churches. After the Avignon Papacy (1309–1377) the popes have mainly resided at the Apostolic Palace within what is now Vatican City, although at times residing instead in the Quirinal Palace in Rome or elsewhere.

In the Catholic Church, a bishop is an ordained minister who holds the fullness of the sacrament of holy orders and is responsible for teaching doctrine, governing Catholics in his jurisdiction, sanctifying the world and representing the church. Catholics trace the origins of the office of bishop to the apostles, who it is believed were endowed with a special charism and office by the Holy Spirit at Pentecost. Catholics believe this special charism and office has been transmitted through an unbroken succession of bishops by the laying on of hands in the sacrament of holy orders.

Diocesan bishops—known as eparchial bishops in the Eastern Catholic Churches—are assigned to govern local regions within the Catholic Church known as dioceses in the Latin Church and eparchies in the Eastern Churches. Bishops are collectively known as the College of Bishops and can hold such additional titles as archbishop, cardinal, patriarch, or pope. As of 2020, there were approximately 5,600 living bishops total in the Latin and Eastern churches of the Catholic Church.

Organized religion, also known as institutional religion, is religion in which belief systems and rituals are systematically arranged and formally established, typically by an official doctrine (or dogma), a hierarchical or bureaucratic leadership structure, and a codification of proper and improper behavior.

In the Catholic Church, a titular church (Italian: titolo cardinalizio) is a church in Rome that is assigned to a member of the clergy who is created a cardinal. These are Catholic churches in the city, within the jurisdiction of the Diocese of Rome, that serve as honorary designations symbolising the relationship of cardinals to the pope, the bishop of Rome. According to the 1983 Code of Canon Law, a cardinal may assist his titular church through counsel or through patronage, although "he has no power of governance over it, and he should not for any reason interfere in matters concerning the administration of its good, or its discipline, or the service of the church".

There are two ranks of titular churches: titles and deaconries. A title (Latin: titulus) is a titular church that is assigned to a cardinal priest (a member of the second order of the College of Cardinals), whereas a deaconry (Latin: diaconia) is normally assigned to a cardinal deacon (a member of the third order of the college). If a cardinal priest or a cardinal deacon is later appointed a cardinal bishop (a member of the first order of the college), he is typically transferred from his titular church to the vacant title of a suburbicarian diocese in the vicinity of Rome. Patriarchs of Eastern Catholic Churches who are created cardinal bishops are not assigned titles of suburbicarian dioceses.

In the Roman Catholic Church, the term minister is used with various meanings. Most commonly, the word refers to a person, either lay or ordained, who is commissioned to perform some act on behalf of the Catholic Church. It is not a particular office or rank of clergy, as is the case in some other Christian organisations; rather, minister may be used as a collective term for vocational or professional pastoral leaders including clergy (bishops, deacons, priests) and non-clergy (theologians and lay ecclesial ministers). It is also used in reference to the canonical and liturgical administration of sacraments, as part of some offices, and with reference to the exercise of the lay apostolate.

There are seven sacraments of the Catholic Church, which according to Catholic theology were instituted by Jesus Christ and entrusted to the Church. Sacraments are visible rites seen as signs and efficacious channels of the grace of God to all those who receive them with the proper disposition.

The sacraments are often classified into three categories: the sacraments of initiation (into the Catholic Church and the mystical body of Christ), consisting of baptism, confirmation, and the Eucharist; the sacraments of healing, consisting of penance and the anointing of the sick; and the sacraments of service: holy orders and matrimony. Furthermore, baptism and penance were also known as the "sacraments of the dead" (in the meaning that the souls of the sinners which are regarded dead before God may obtain life through these sacraments), whereas the other five are collectively the "sacraments of the living".