"The Eastern Catholic Churches, historically called Uniate Churches, are 23 self-governing particular churches in full communion with the Pope, which make up the Catholic Church together with the Latin Church. Liturgies of the 23 Eastern Catholic churches include the Byzantine, Alexandrian, Armenian, East Syrian, and West Syrian Rites, traditions that are shared with other Eastern Christian churches, the Eastern Orthodox and Oriental Orthodox churches. Although some theological issues divide them from other Eastern churches, they admit members of these latter churches to the Eucharist and the other sacraments, as governed by Oriental canon law.[a]
As a result of emigration from their original regions in the Middle East, North Africa, Eastern Europe and India, Eastern Catholics have spread to Western Europe, the Americas and Oceania, where eparchies have been established alongside Latin Church dioceses...."
