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Prefecture. A prefecture is any sort of administrative jurisdiction or a controlled subdivision in countries that utilize prefects, and within some international church structures. In ancient Rome, a prefecture referred to a district governed by an appointed prefect.
The West's use of prefecture to label these Japanese regions stems from 16th-century Portuguese explorers' and traders' use of  prefeitura  to describe the fiefdoms they encountered there. Its original sense in Portuguese, however, was closer to  municipality  than  province .