§ 02 · King James Bible
Revelation 9:11
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.
Simple English
They had a leader who was an angel from the deep pit. His name in Hebrew is Abaddon and in Greek it's Apollyon.
* Work in progress - there may be occasional inaccuracies