1) Abaddon 2) Satan 1) The destroyer 
• (n.) The Destroyer; -- a name used (Rev. ix. 11) for the angel of the bottomless pit, answering to the Hebrew Abaddon.
Name given to the devil (Revelation 9.11) as a translation of the Hebrew Abaddon (the angel of the bottomless pit). ...
A·pol'ly·on noun [ Greek ... destroying, from ..., ..., to destroy utterly; ... from, entirely + ... to destroy.] The Destroyer; -- a name used (Rev. ix. 11) for the angel of the bottomless pit, answering to the Hebrew Abaddon . 
In Christian mythology, Apollyon (the destroyer) is the king of the bottomless pit.
the destroyer; the angel of the bottomless pit; Abaddon. Rev. 9:11.