This kind of halo symbolism can carry a lot of interpretations.
It may have started in Iran as a sign of divine approval - that someone was
rightfully a monarch.
[
books.google.com]
[
www.google.com]
One dared not rebel against, or even question someone whom God had singled out for divine favor.
A big difference from "Let the little children come to me, and do not hinder them, for the kingdom of heaven belongs to
such as these." "