In the Eastern Orthodox Churches, a metropolis (also called metropolia or metropolitanate) is a type of diocese, along with eparchies, exarchates and archdioceses.
In non-Greek Orthodox churches, mainly Slavic Orthodox, the title of Metropolitan is given to the heads of autocephalous churches or of a few important episcopal sees.
Its ordinary is a metropolitan archbishop and the see itself is an archdiocese.
[2] Other non-metropolitan archdioceses are directly subject to the Holy See and are merely "aggregated" to an ecclesiastical province, without being part of it.
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