Page "Eparchy" Paragraph 5

In the latter half of the 7th century, the old provincial administration was replaced by the thematic system.

Even after that however, the term eparchos remained in use until the 840s for the senior administrative official of each thema, under the governing strategos.

Thereafter, eparchs are evident in some cases as city governors, but the most important by far amongst them was the Eparch of Constantinople, whose office had wide-ranging powers and functioned continuously until the 13th century.