" And they had a king over them, which is
the angel of the bottomless pit, whose name
in the Hebrew tongue is Abaddon, but in
the Greek tongue hath his name Apollyon."
Revelation 9:11

Abaddon or Apollyon is a subordinate
prince under the rule of Satan. Satan has
many demon angels under him [Matthew
25:41].

Satan has princes who have power to resist
the missions of the righteous angels.
[Daniel 10:13].