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 )

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

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 ).

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.

About a thousand years after that, when the Roman Empire was divided, it became capital of the Eastern section.

for still others, mostly of the nineteenth-century immigration, it was Roman Catholicism, and for a small minority it was Eastern Orthodoxy.

Most historians, including Edward Gibbon, date the defeat at Manzikert as the beginning of the end of the Eastern Roman Empire.

* 313 – Battle of Tzirallum: Emperor Licinius defeats Maximinus II and unifies the Eastern Roman Empire.

In Western philosophy, the spread of Christianity through the Roman Empire marked the ending of Hellenistic philosophy and ushered in the beginnings of Medieval philosophy, whereas in Eastern philosophy, the spread of Islam through the Arab Empire marked the end of Old Iranian philosophy and ushered in the beginnings of early Islamic philosophy.

* 1203 – Isaac II Angelos, restored Eastern Roman Emperor, declares his son Alexios IV Angelos co-emperor after pressure from the forces of the Fourth Crusade.

Saint Alcuin ( Alcuin of York ) is considered as a saint by all the main branches of Christianity: Roman Catholic, Anglican and Eastern Orthodox Churches.

In 394 Alaric led a Gothic force of 20, 000 that helped the Eastern Roman Emperor Theodosius defeat the Frankish usurper Arbogast at the Battle of Frigidus.

Alphonse might have met Eastern Roman Emperor Manuel I Comnenus during his visit there.

* 1278 – Michael IX Palaeologus, co-ruling Eastern Roman Emperor ( d. 1320 )

The Eastern Orthodox generally recognize Roman Catholic orders, but have a different concept of the apostolic succession as it exists outside of Eastern Orthodoxy.

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

The Roman Catholic, Eastern Orthodox and Coptic and Old Catholic Churches consider this anointing to be a sacrament.

Liturgical rites of the Catholic Church, both Western and Eastern, other than the Roman, have a variety of other forms for celebrating the sacrament.

The teaching of the Eastern Orthodox Church on the Holy Mystery ( sacrament ) of Unction is similar to that of the Roman Catholic Church.

* 529 – First draft of the Corpus Juris Civilis ( a fundamental work in jurisprudence ) is issued by Eastern Roman Emperor Justinian I.

In the Middle Ages, regicide was rare in Western Europe, but it was a recurring theme in the Eastern Roman Empire.

Athanasius is counted as one of the four Great Doctors of the Church in the Roman Catholic Church as well as one of the Great Doctors of the Church in Eastern Orthodoxy, where he is also labeled the " Father of Orthodoxy ".