noun
Caesaropapism
Historical term referring to a political system where the secular ruler also holds supreme authority in religious matters, particularly in the Byzantine Empire.
ビザンツ帝国では皇帝教皇主義が採用されていた。
Caesaropapism was adopted in the Byzantine Empire.
政教分離 means separation of church and state, the opposite of Caesaropapism.
Compound of 皇帝 (emperor), 教皇 (pope), and 主義 (doctrine). The term is a direct translation of the Western concept of Caesaropapism.