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.

The Eastern Orthodox receive the Septuagint as the textual basis for the entire Old Testament, in books both protocanonical and deuteroncanonical, to be used both in the Greek for liturgical purposes, and as the basis for translations in to the vernacular.

In the Eastern liturgical tradition, a priest can celebrate the Divine Liturgy only with the blessing of a bishop.

Eastern Catholic cardinals continue to wear the normal dress appropriate to their liturgical tradition, though some may line their cassocks with scarlet and wear scarlet fascias, or in some cases, wear Eastern-style cassocks entirely of scarlet.

Ezekiel is commemorated as a saint in the liturgical calendar of the Eastern Orthodox Church — and those Eastern Catholic Churches which follow the Byzantine Rite — on July 21 ( for those churches which use the traditional Julian Calendar, July 21 falls on August 3 of the modern Gregorian Calendar ).

The central form of chant in the Eastern Orthodoxy is Byzantine Chant, which is used to chant all forms of liturgical worship.

He is commemorated on the Eastern Orthodox liturgical calendar, with a feast day on October 17 ( for those churches which follow the Julian Calendar, October 17 currently falls on October 30 of the modern Gregorian Calendar ).

On the Eastern Orthodox liturgical calendar, his feast day is December 2.

On the Eastern Orthodox liturgical calendar his feast day is September 22 also ( for those churches which follow the traditional Julian calendar, September 22 currently falls on October 5 of the modern Gregorian calendar ).

Although Barlaam was never formally canonized, Josaphat was, and they were included in earlier editions of the Roman Martyrology ( feast day 27 November ) — though not in the Roman Missal — and in the Eastern Orthodox Church liturgical calendar ( 26 August in Greek tradition etc.

On the Eastern Orthodox liturgical calendar, his feast day is December 1 ( for those churches which follow the traditional Julian Calendar, December 1 currently falls on December 14 of the modern Gregorian Calendar ).

The Congregation for the Oriental Churches ( Congregatio pro Ecclesiis Orientalibus ) is the congregation of the Roman Curia responsible for contact with the Eastern Catholic Churches for the sake of assisting their development, protecting their rights and also maintaining whole and entire in the one Catholic Church, alongside the liturgical, disciplinary and spiritual patrimony of the Latin Rite, the heritage of the various Oriental Christian traditions.

The Congregation for Divine Worship and the Discipline of the Sacraments ( Congregatio de Cultu Divino et Disciplina Sacramentorum ) is the congregation of the Roman Curia that handles most affairs relating to liturgical practices of the Latin Catholic Church as distinct from the Eastern Catholic Churches and also some technical matters relating to the Sacraments.

** The beginning of the new liturgical year ( Eastern Orthodox Church and the Eastern Catholic Church )

The Eastern Orthodox also use LXX untranslated where Greek is the liturgical language, e. g. in the Orthodox Church of Constantinople, the Church of Greece and the Cypriot Orthodox Church.

On the Eastern Orthodox liturgical calendar, his feast day is August 20.

On the Eastern Orthodox liturgical calendar, his feast day is December 3.

The decree recognizes the right of Eastern Catholics to keep their own distinct liturgical practices.

The twenty-two Eastern Catholic churches are all in communion with the Holy See at the Vatican, but are rooted in the theological and liturgical traditions of Eastern Christianity.

The Eastern churches ( excepting the non-liturgical dissenting bodies ) each belong to one of several liturgical families:

The common cultural bond of Eastern Orthodox Christianity and written Church Slavonic ( a literary and liturgical Slavic language developed by 8th century missionaries Saints Cyril and Methodius ) fostered the emergence of a new geopolitical entity, Kievan Rus ' — a loose-knit network of principalities, established along preexisting trade routes, with major centers in Novgorod ( currently Russia ), Polatsk ( in Belarus ) and Kiev ( currently in Ukraine ) — which claimed a sometimes precarious preeminence among them.

It played an important role in the history of the Slavic languages and served as a basis and model for later Church Slavonic traditions, and some Eastern Orthodox and Eastern Catholic churches use Church Slavonic as a liturgical language to this day.