An ecclesiastical province is a general term for large jurisdiction of Christian religious government including Western Christianity and Eastern Christianity. In the Greco-Roman world, ecclesia (Greek ἐκκλησίᾱ, ekklēsiā (Latin ) meaning ", ") was used to refer to a lawful assembly, or a called legislative body. As early as Pythagoras, the word took on the additional meaning of a community with shared beliefs. This is the meaning taken in the Greek translation of the Hebrew Scriptures (the Septuagint), and later adopted by the Christian community to refer to the assembly of believers.
In the history of Western world (sometimes more precisely as Greco-Roman world) adopted by the Roman Empire and the Byzantine Empire, Christian ecclesiastical provinces were named by analogy with the secular Roman province as well as certain extraterritorial formations of western world in early medieval times (see Early Middle Ages). The administrative seat of each province is a episcopal see. In hierarchical Christian churches that have dioceses, a province is a collection of those dioceses (as a basic unit of administration).
Over the years certain provinces adopted the status of metropolis and have a certain degree of self-rule. A bishop of such province is called the metropolitan bishop or metropolitan. The Roman Catholic Church (both Latin and Eastern Catholic), the Orthodox Churches and the Anglican Communion all have provinces. These provinces are led by a metropolitan archbishop.