With a membership currently estimated at over 85 million members worldwide, the Anglican Communion is the third largest Christian communion in the world, after the Roman Catholic Church and the Eastern Orthodox Churches.

Some Eastern Orthodox Churches have issued statements to the effect that Anglican orders could be accepted, yet have still reordained former Anglican clergy ; other Orthodox churches have rejected Anglican orders altogether.

** April 6 ( Eastern Orthodox liturgics )

** April 15 ( Eastern Orthodox liturgics )

** April 30 ( Eastern Orthodox liturgics )

** August 22 ( Eastern Orthodox liturgics )

** August 6 ( Eastern Orthodox liturgics )

** August 9 ( Eastern Orthodox liturgics )

The Eastern Orthodox Church observes several All Souls ' Days during the year.

The Eastern Orthodox Church dedicates several days throughout the year to the dead, mostly on Saturdays, because of Jesus ' resting in the Holy Sepulchre on that day.

** August 13 ( Eastern Orthodox liturgics )

In the Eastern Orthodox and Eastern Catholic Churches, the Abbot is referred to as the Hegumen.

** August 2 ( Eastern Orthodox liturgics )

** April 1 ( Eastern Orthodox liturgics )

Arianism is defined as those teachings attributed to Arius which are in opposition to mainstream Trinitarian Christological doctrine, as determined by the first two Ecumenical Councils and currently maintained by the Roman Catholic Church, the Eastern Orthodox Churches, the Oriental Orthodox Churches, and most Reformation Protestant Churches.

** August 1 ( Eastern Orthodox liturgics )

** August 3 ( Eastern Orthodox liturgics )

** April 26 ( Eastern Orthodox liturgics )

In the Catholic Church ( both the Latin Rite and Eastern Catholic ), Eastern Orthodox, Coptic and Anglican abbeys, the mode of election, position, rights, and authority of an abbess correspond generally with those of an abbot.

** August 8 ( Eastern Orthodox liturgics )

** April 16 ( Eastern Orthodox liturgics )

Lecky and Stanley's Eastern Church.

Trinitarianism remained the dominant doctrine in all major branches of the Eastern and Western Church and later within Protestantism until modern times.

) However, Ambrosian chant was named in his honor due to his contributions to the music of the Church ; he is credited with introducing hymnody from the Eastern Church into the West.

( Eastern Orthodox Church )

** Abraham of Smolensk ( Eastern Orthodox Church )

* Saint Anastasius Sinaita ( of Sinai ) – theologian, Father of the Eastern Orthodox Church, monk, priest, and abbot of the monastery at Mt.

* Assumption of Mary ( Eastern Orthodox Church, a public holiday in the Republic of Macedonia, Serbia, and Georgia )

In the Eastern Orthodox Church he is also considered a saint, his feast day being celebrated on 15 June .< ref >

Further, proponents of the necessity of the personal apostolic succession of bishops within the Church point to the universal practice of the undivided early Church ( up to AD 431 ), before being divided into the Church of the East, Oriental Orthodoxy, the Eastern Orthodox Church and the Roman Catholic Church.

Churches that claim some form of episcopal apostolic succession, dating back to the apostles or to leaders from the apostolic era, include the Roman Catholic Church, the Eastern Orthodox and Oriental Orthodox Churches, the Church of the East, the Anglican Communion, and some Lutheran Churches ( see below ).

Roman Catholics recognize the validity of the apostolic successions of the bishops, and therefore the rest of the clergy, of the Eastern Orthodox, Oriental Orthodox, Church of the East, and the Old Catholic Church ( Union of Utrecht only ).

Like the Roman Catholic Church, these ancient Eastern churches may use the doctrine of apostolic succession in ministry in their apologetics against Protestantism.

*** Feast of the Dormition of the Theotokos ( Eastern Orthodox, Oriental Orthodox and Eastern Catholic Churches )

Some Protestants feel that such claims of apostolic succession are proven false by the differences in traditions and doctrines between these churches: Roman Catholics and Eastern Orthodox consider both the Church of the East and the Oriental Orthodox churches to be heretical, having been anathematized in the early ecumenical councils of Ephesus ( 431 ) and Chalcedon ( 451 ) respectively.

He is venerated by the Roman Catholic Church, Oriental and Eastern Orthodox churches, the Lutherans, and the Anglican Communion.

* Luso-Brazilian invasion ( 1816-1820 ): Was an armed conflict between the United Kingdom of Portugal, Brazil and the Algarves and the partisans of José Artigas over the Banda Oriental ( Eastern Bank ), present-day Uruguay.

* Cisplatine War ( 1825 – 1828 ): Armed conflict over an area known as Banda Oriental or " Eastern Shore " between the United Provinces of the Río de la Plata and Empire of Brazil in the aftermath of the United Provinces ' emancipation from Spain.

The Eastern Orthodox, Oriental Orthodox and Eastern Catholic churches may have minor differences in their lists of accepted books.

Within the Catholic Church, Eastern Orthodox, Oriental Orthodox, Anglican, Old Catholic, Independent Catholic Churches, and in the Assyrian Church of the East, bishops claim apostolic succession, a direct historical lineage dating back to the original Twelve Apostles.

Bishops form the leadership in the Roman Catholic Church, the Eastern Orthodox Church, the Oriental Orthodox Churches, the Anglican Communion, the Lutheran Church, the Independent Catholic Churches, the Independent Anglican Churches, and certain other, smaller, denominations.

; Catholicos: Catholicoi are the heads of some of the Eastern Orthodox, Oriental Orthodox, and Eastern Rite Catholic sui iuris churches ( notably the Armenian ), roughly similar to a Patriarch ( see above ).

In Catholicism, Eastern Orthodoxy, Oriental Orthodoxy, Lutheranism, and Anglicanism, only a bishop can ordain other bishops, priests, and deacons.

In Catholic, Eastern Orthodox, Oriental Orthodox and Anglican cathedrals there is a special chair set aside for the exclusive use of the bishop.

However, in the Byzantine and other Eastern rites, whether Eastern or Oriental Orthodox or Eastern Catholic, chrismation is done immediately after baptism, and thus the priest is the one who confirms, using chrism blessed by a bishop.

The Catholic Church does recognise as valid ( though illicit ) ordinations done by breakaway Catholic, Old Catholic or Oriental bishops, and groups descended from them ; it also regards as both valid and licit those ordinations done by bishops of the Eastern churches, so long as those receiving the ordination conform to other canonical requirements ( for example, is an adult male ) and an orthodox rite of episcopal ordination, expressing the proper functions and sacramental status of a bishop, is used ; this has given rise to the phenomenon of episcopi vagantes ( for example, clergy of the Independent Catholic groups which claim apostolic succession, though this claim is rejected by both Orthodoxy and Catholicism ).

There is a mutual recognition of the validity of orders amongst Roman Catholic, Eastern Orthodox, Old Catholic, Oriental Orthodox and Assyrian Nestorian churches.

A cathedral is a church, usually Roman Catholic, Anglican, Oriental Orthodox or Eastern Orthodox, housing the seat of a bishop.

It is the internal ecclesiastical law governing the Catholic Church ( both Latin Rite and Eastern Catholic Churches ), the Eastern and Oriental Orthodox churches, and the Anglican Communion of churches.