It's an offer he can't refuse. It's also and offer that will cost him more dearly than he can imagine, I'm sure. Very good work by the emperor.
The Byzantine Emperors held as a title "God's Vicegerent on Earth".
Why do you always say Vice Gerent of Christ, not Vice Regent?
Oh, and that was incredible!
Christ of course.
...but I'm sure there were clerics around who took notes and will publish them