exarch
/ˈeksɑːk/noun
1
- (in the Orthodox Church) a bishop lower in rank than a patriarch and having jurisdiction wider than the metropolitan of a diocese（正教会中的）督主教（地位低于宗主教, 管辖权大于都主教）。
2
- historical a governor of a distant province under the Byzantine emperors〈史〉（拜占庭帝国即东罗马帝国君主以下偏远省份的）总督。
词源
late 16th cent.: via ecclesiastical Latin from Greek exarkhos， from ex- 'out of'+arkhos 'ruler'.