I like actual owls too. God’s creation.
But I don’t like the symbolic representation here.
In answer to your question: on the satanic end of things, there is also a hierarchy. Could be that Martin Luther was right about the pope, in which case the pope answering to and being “protected” by the devil makes perfect sense.
... his craft and power are great, and armed with cruel hate. On earth is not his equal
This false pope is not like most other popes. Please do not portray his behavior as typical of the RC Church.
The caption above it appears to read "Gregory XIII Pon(tifex) Opt(timus) Max(imus) in the Year VIII" In the center is a stylized owl with a dragon in its heart. There is a lot of symbolism here, and I will not get into all of it. It appears to be associated with one pope.
I do not know that this resolves the question of the guardian, but it is interesting. (Or I may have missed something that resolved it in the 600 posts I skipped over this evening...)