There has been some big news recently in the Ukrainian Greek Catholic Church. A few days ago, their bishops elected a new head for their "branch" of Catholicism (their de facto Patriarch), 40 year-old Sviatoslav Shevchuk. I don't use the term "branch" as if it were a division in the negative sense, so I will clarify.
In my experience, some (perhaps even most?) Roman Catholics don't even know of the existence of other Catholic Churches, which vary from Roman Catholicism in liturgy and popular piety but are still in communion with the Pope and Roman Catholics. I certainly knew nothing about them until an Eastern Catholic friend enlightened me in 2005. Hopefully this blog post will provide some exposure for those who haven't experienced the traditions of the various Eastern Churches.
The Eastern Catholic Churches are autonomous, self-governing (in Latin, sui iuris) particular churches in full communion with the Bishop of Rome - the Pope. Together with the Roman/Latin Church, they compose the worldwide, universal Catholic Church. They preserve some centuries-old eastern liturgical, devotional and theological traditions and emphases.
The term Eastern Catholic Churches refers to 21 of the 22 autonomous particular Churches in communion with the Bishop of Rome. The Roman Catholic Church is the 22rd Church. The Eastern Churches follow five main Eastern traditions: Alexandrian, Antiochian, Armenian, Byzantine and Chaldean. They retain their ceremonies, traditions, laws, and customs which date back to the Apostles, while at the same time preserving the necessary communion with the Bishop of Rome. While they are self-governing, they all recognize the central role of the Bishop of Rome within the College of Bishops and his infallibility on those occasions when speaking ex cathedra.
After the Great Schism in 1054 which split the Churches in the East (now known as the Eastern Orthodox) from the Roman Catholic Church, some Eastern Churches chose to regain communion with the Pope and thus have become the Eastern Catholic Churches. Some have never broken communion, some were separated only geographically for a period of time, and others re-joined the Church much later. The diagram below shows the historical foundations of the 21 Eastern Catholic Churches, which all have their various traditions and liturgies. Most traditions are associated with the Byzantine Rite, while over the centuries the various Western rites have been unified into a single Roman/Latin Rite as we know it today:

While the Popes haven't interfered with the liturgies of the East, they have always shown their respect for Eastern traditions. For example, Venerable Pope Pius XII opens his Encyclical on the Roman liturgy, "Mediator Dei," with the comment: "If in this encyclical letter We treat chiefly of the Latin liturgy, it is not because We esteem less highly the venerable liturgies of the Eastern Church, whose ancient and honorable ritual traditions are just as dear to Us. The reason lies rather in a special situation prevailing in the Western Church, of sufficient importance, it would seem, to require this exercise of Our authority."
One of the most widespread Eastern Liturgies is the Divine Liturgy of Saint John Chrysostom, composed by Saint John Chrysostom in the late 300's A.D. Popes John XXIII and John Paul II have publicly celebrated the Divine Liturgy of Saint John Chrysostom - with Pope John XXIII using the Papal Tiara as the bishop's crown. When Christians debate about worship in the "early Church," this liturgy really is from the early Church, and many might be surprised to witness how ornate it really is:
In this recent video, the new Patriarch is "enthroned" as the head of the Ukrainian Catholic Church. The ceremonies date back to the earliest traditions of Christianity:
The Eastern Catholic Churches are represented in the Holy See and the Roman Curia through the Congregation for the Oriental Churches, which is made up of a Cardinal Prefect (who directs and represents it with the help of a Secretary) and 27 Cardinals, one Archbishop and 4 Bishops, designated by the Pope.
Historically, Eastern Catholic Churches were located in Eastern Europe, the Asian Middle East, Northern Africa and India, but due to migration they are now also in Western Europe, the Americas and Oceania where eparchies have been established alongside the Latin dioceses. These days, it is easy to find an Eastern Catholic Church, and their Masses (called The Divine Liturgy) fulfills any Catholic's Sunday obligation.
Eastern Catholic Churches can be considered to be the "counterparts" to the Eastern Orthodox Churches who have remained divided from Rome since the Great Schism in 1054. For example, there is a Ukrainian Catholic Church and a Ukrainian Orthodox Church, the former maintaining communion with Rome.
When speaking in a
recent interview about Ukrainian Catholic martyrs, the new Ukrainian Catholic Archbishop commented on the necessity of communion with Rome: "Our Martyrs were martyrs for unity with the Holy Father."
Eastern Catholic Churches make up a small percentage of the membership in the Catholic Church when compared to the Latin Rite, which has over one billion members. The largest sui juris church is the Byzantine Ukrainian Greek Catholic Church with 4.3 million members and the second largest is the Syriac Syro-Malabar Catholic Church at 3.9 million members.
In a way, this plurality of Catholic Churches shows the authenticity of the Catholic Church's teachings. Sent by Christ himself, the Apostles went to various parts of the world to "baptize all nations" and spread the Faith which they learned directly from Christ. Understandably, the practice of this Faith was manifested in different traditions and ceremonies throughout present-day Europe, Africa, the Middle East, and the Mediterranean regions with little communication between them, but the liturgies and ceremonies are strikingly similar. To this day, all of the Churches teach Seven Sacraments, Transubstantiation in the Eucharist, an ordained Priesthood, an all-male Priesthood, reverence for Mary (the Theotokos or "God-Bearer" in Greek), sacramental confession to a priest, etc. How can we doubt that these teachings came from Christ himself when they are present in every Eastern and Western Church and tradition before the Protestant split?
Much more could be said about how the Liturgy professes the Faith, but a great place to start is with Pope Benedict XVI's book The Spirit of the Liturgy, especially Part 4, Chapter 1.
"Mnohaya Lita," ("Many Years") to Archbishop Shevchuk!