[Cronos]

I think the Byzantine emperor demanded full proskynesis ie go flat on your face, like a Muslim at prayer

[pierrem15]

Already true I think of the Roman Emperors by the late 3rd century, around when they started to be portrayed with halos, which were once reserved for the gods.

In Ravenna at the Church of San Vitale, both Justinian and Theodora have halos.

[Angelino97]

I think the Byzantine emperor demanded full proskynesis ie go flat on your face, like a Muslim at prayer

Catholic priests go prostrate when they receive the Sacrament of Holy Orders. It's probably the same with the Orthodox Church.

I realize Protestants might find certain Catholic & Orthodox practices to be a little odd.