The emperor is within the church, not above the church.
Imperator intra ecclesiam, non supra ecclesiam est.

Politicians
Theodosius I
Roman emperor (347-395, r. 379-395), Theodosius the Great. The last to rule the entire empire, he made Nicene Christianity the state religion via the Edict of Thessalonica (380), but presided over the 390 massacre.
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Source: アンブロシウス『書簡集』第21書(対テオドシウス1世、伝統的引用)Verified
Theodosius I's Other Quotes
It is our will that all peoples under the rule of our clemency shall hold the religion which the divine apostle Peter delivered to the Romans.
No mortal shall be permitted to approach a temple or to pass through its sanctuary.
If I have sinned, give me the remedy; if I have not, instruct me.
Today I have killed a man.