The origin of the definition of the patriarch of the West is linked to the disestablishment of the ancient system based on the three apostolic centers of
Rome,
Antioch (both founded by
Saint Peter) and Patriarchy of Alexandria (founded by
Saint Mark, the disciple of Peter), and the establishment, despite papal opposition, of the new
Pentarchy, with the
First Council of Constantinople in 381 and the
Council of Chalcedon in 451, which led to the elevation of the Patriarchates of
Constantinople and Jerusalem. In this system, with the exception of Rome, the other four patriarchates fell under the authority of the
Byzantine Empire and came to correspond with territorially well-defined entities. Rome, on the other hand, became the seat with authority over the territories of the
Western Roman Empire. In 450,
Byzantine Emperor Theodosius II addressed a letter to
Pope Leo I, in which he explicitly mentioned him as a patriarch for the West (this is the first mention of a pope in this capacity). After the Western Roman Empire collapsed in 476 and
Justinian I extended the eastern legislation on Rome with the
Pragmatic sanction of 554, the imperial ecclesiastical system of the Pentarchy was fully put into effect. In 642, as the Byzantine emperors were imposing the support for
Miaphysitism on the popes,
Pope Theodore I formally assumed for the first time the title of patriarch of the West. On 22 March 2006, the Vatican released a statement explaining the omission of the title from the
Annuario Pontificio on the grounds of expressing a "historical and theological reality" and of "being useful to ecumenical dialogue". The Vatican stated that the title patriarch of the West symbolized the pope's special relationship with, and jurisdiction over, the
Latin Church—and that the omission of the title neither symbolizes in any way a change in this relationship, nor distorts the relationship between the Holy See and the
Eastern Churches, as solemnly proclaimed by the
Second Vatican Council. In 2024,
Pope Francis reinstated the title, reversing
Pope Benedict XVI’s 2006 renunciation of it. == References ==