A bishop in the Eastern Orthodox Church ranking immediately below a patriarch.
The ruler of a province in the Byzantine Empire.
[Late Latin exarchus, an overseer, from Greek exarkhos, from exarkhein, to lead : ex-, ex- + arkhein, to rule.] ex·arch'al adj., ex'ar'chate (ěk'sär'kāt), ex'ar'chy (-kē) n.