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I have been frustrated by the following issue.

In the structure of the late roman empire, provinces were grouped into diocese, which were in turn grouped into praetorian prefectures.

The civilian and military administration of these units were separate, and followed the hierarchy.

land : province < diocese < praetorian prefecture < empire

civilian: corrector < vicarius < praetorian prefect (< emperor)

military: Dux < m. militum/c. r. militaris < emperor

I have read that the geographic divisions of the catholic church are leftovers from this system. For example, ecclesiastical provinces and diocese started off as their secular roman counterparts.

But in the church, diocese are grouped into provinces, not the other way around as used to be the case.

It seems to go like this:

parish priest < bishop < metropolitan bishop < patriarch < emperor

My intuition would suggest that bishops oversaw provinces, not diocese. And that metropolitan bishops governed the church from diocesan capitals, not provincial capitals as I have seen written.

It seems clear that the church was not organized in a way directly corresponding to the rest of the state. For example, the patriarchates do not correspond to praetorian prefectures, despite their similar number and hierarchical place.

So anyway, what exactly is going on here?

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As noted in The Catholic Encyclopedia (published 1907 and now in the public domain and fully digitized) there has been a gradual change in the meaning and usage of the term diocese over nearly the past two millennia, as well as varied usage between those regions formerly part of the Eastern and Western Roman Empire respectively:

Originally the term diocese (Gr. dioikesis) signified management of a household, thence administration or government in general. This term was soon used in Roman law to designate the territory dependent for its administration upon a city (civitas). What in Latin was called ager, or territorium, namely a district subject to a city, was habitually known in the Roman East as a diœcesis. But as the Christian bishop generally resided in a civitas, the territory administered by him, being usually conterminous with the juridical territory of the city, came to be known ecclesiastically by its usual civil term, diocese. This name was also given to the administrative subdivision of some provinces ruled by legates (legati) under the authority of the governor of the province.
On the other hand, the present meaning of the word diocese is met with in Africa at the end of the fourth century (cc. 50, 51, C. XVI, qu. 1), and afterwards in Spain, where the term parochia, occurring in the ninth canon of the Council of Antioch, held in 341, was translated by "diocese" (c. 2, C. IX, qu. 3). This usage finally became general in the West, though diocese was sometimes used to indicate parishes in the present sense of the word (see PARISH).

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