Parallel
Revelation 9:11
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
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 (note: that is to say, A destroyer).
They were ruled by a king, the angel of the Abyss. His name in Hebrew is Abaddon, and in Greek it is Apollyon (note: Apollyon means Destroyer.).