Catholic priests are ordained by bishops through the sacrament of
holy orders. Catholic bishops are ordained in an unbroken line of
apostolic succession back to the
Twelve Apostles depicted in the
Catholic Bible. The ceremony of
Eucharist, which can only be confected by priests, in particular derives from the story of the
Last Supper, when
Jesus Christ distributed bread and wine in the presence of the
Twelve Apostles, in some versions of the
Gospel of Luke commanding them to "do this in memory of me". (Some Protestant critics have challenged the historical accuracy of the claim of unbroken succession.) Catholic tradition says the apostles in turn selected other men to succeed them as the bishops (
episkopoi, Greek for "overseers") of the Christian communities, with whom were associated
presbyters (
presbyteroi, Greek for "elders") and
deacons (
diakonoi, Greek for "servants"). As communities multiplied and grew in size, the bishops appointed more and more presbyters to preside at the
Eucharist in place of the bishop in the multiple communities in each region. The
diaconate evolved as the liturgical assistants of the bishop and his delegate for the administration of church funds and programmes for the poor. Today, the rank of "presbyter" is typically what one thinks of as a priest, although church catechism considers both bishops and presbyters as "priests". The Pentarchic Church of the three first Holy Synods share the tradition of the sacrament of ordination by which the grace of apostolic succession is secured; this includes the
Church of the East (split from the Catholic Church in 424), the
Oriental Orthodoxy (split in 451) and the
Eastern Orthodox Church (split with the
East–West Schism of 1054). During the
Protestant Reformation,
Martin Luther and
William Tyndale advocated the
priesthood of all believers, the idea that all baptized Christians are equally part of the sacred priesthood and that ministerial priesthood has no real authority beyond that of the congregation. This was a complex and controversial matter, contributing to further schisms within the
Reformation movement of the
Church. The Lutheran-Evangelical
Swedish Church maintains the sacrament of ordination and the doctrine of Apostolic Succession, as does the
Anglican Church. The doctrine is interpreted in various ways by different Protestant denominations, with some dropping apostolic succession and holy orders as a sacrament, as per example the
Church of Norway and
Denmark who keep their respective Monarchs as
Pontiffs, sovereign heads of the church-hierarchy. There are different requirements for the performance of the Eucharistic ceremony to be valid among different kinds of Christian denominations, in regard of who are to oversee the sanctity of the Eucharist and stand as guarantor that the Holy Service is properly performed. There are significant differences particularly concerning the strictness/liberality of who is welcome to receive the sacraments. Through the principle of
church economy, the Catholic Church
Norms at the same time recognizes as valid the Holy Service of denominations practicing the
Nicene Creed (Symbolum Nicaenum), and deem illicit and therefore find the ordination of priests "objectively sacrilegious" in denominations separated from the one, holy, apostolic and catholic (i.e. universal)
Church, which holds an unbroken apostolic succession. Alongside the
Eastern Catholic Churches, it shares and defines the so-called
First seven ecumenical councils. The Eastern Catholic Churches or Oriental Catholic Churches, also called the Eastern-rite Catholic Churches, Eastern Rite Catholicism, or simply the Eastern Churches are 23 Eastern Christian sui iuris (autonomous) particular churches of the Catholic Church, in full communion with the
Bishop of Rome. Although they are distinct theologically, liturgically, and historically from the Latin Church, they are all in full communion with it and with each other. The
Coptic Catholic Church among these 23 is not identical with the
Coptic Orthodox Patriarchate of Alexandria. The
Old Catholic church broke communion with the Roman Catholic Church in the 1870s and are thus schismatic. Furthermore, in 2008, the Old Catholics of the
Union of Scranton broke away from the
Union of Utrecht after the Union of Utrecht began ordaining women and blessing same-sex unions. Since then, the Union of Scranton has expanded to include the
Nordic Catholic Church (NCC) which separated from the
Church of Norway under sovereignty of the King of Norway, in opposition to similar practices, and has developed a more Catholic theology. The Nordic Catholic Church includes the
Christ-Catholic Church of Germany as a daughter-church, which traces its history through the Old Catholics of the
Union of Utrecht and the
Polish-Catholic Church of the Republic of Poland. The
Holy Apostolic Catholic Assyrian Congregation of the East holds apostolic succession, but is not in communion with either the Oriental Orthodox Congregation in full communion with the Roman or the Eastern Orthodox Church. In contrast to the Evangelical-Lutheran religion of Denmark and Norway, the
Church of Sweden practices Apostolic Succession, and holds Ordination as a sacrament. Recognition of the ordination of
Anglican Church priests was denied in 1896 by
Pope Leo XIII through the papal bull
Apostolicae curae over a dispute in the wording of the Anglican ceremony starting in the 1500s. In 1965, the
Second Vatican Council released
Presbyterorum Ordinis on the ministry and life of priests, and
Optatam Totius on the training of priests. Since 1970, the number of Catholic priests in the world has decreased by about 5,000, to 414,313 priests as of 2012, This has resulted in a worldwide
shortage of Catholic priests. In 2014, 49,153 Catholic parishes had no resident priest pastor. In the 1990s and 2000s, the
cases of sexual abuse by Catholic priests gained worldwide attention, with thousands of accused priests and tens of thousands of alleged victims. The church estimated that over the 50 years ending in 2009, between 1.5% and 5% of Catholic priests had a sexual encounter with a minor, and
Thomas Plante estimated a figure of 4%. Public anger was fueled by the revelation that many accused priests were transferred to another parish rather than being removed from ministry or reported to police. The scandal caused some Catholics to leave the church, made recruitment of new priests more difficult, and resulted in billions of dollars in lawsuit
settlements and bankruptcies that increased financial pressure to close parishes with declining membership. In February 2019,
Pope Francis acknowledged the
clerical abuse of
nuns, including
sexual slavery. ==Theology of the priesthood==