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 Abadon: but in the Greek tongue, Apollion, that is to say: a destroyer.

Ephesians 2:2

in the which, in time past, ye walked, according to the course of this world, and after the governor that ruleth in the air, the spirit that now worketh in the children of unbelief,

Job 26:6

yea, and all they which dwell beneath in the hell are not hid from him, and the very destruction itself cannot be kept out of his sight.

John 8:44

Ye are of your father the devil, and the lusts of your father, ye will do. He was a murderer from the beginning; And abode not in the truth, because there is no truth in him. When he speaketh a lie, then speaketh he of his own. For he is a liar, and the father thereof.

John 12:31

Now is the judgment of this world: now shall the prince of this world be cast out a doors.

John 14:30

Hereafter will I not talk many words unto you. For the chief ruler of this world cometh, and hath nought in me.

John 16:11

And of judgment, because the chief ruler of this world is judged already.

2 Corinthians 4:4

in whom the God of this world hath blinded the minds of them which believe not, lest should shine unto them the light of the glorious gospel of Christ, which is the image of God.

1 John 4:4

Little children, ye are of God, and have overcome them: for greater is he that is in you, than he that is in the world.

1 John 5:19

We know that we be of God, and that the world is altogether set on mischief.

Revelation 9:1-2

And the fifth angel blew, and I saw a star fall from heaven unto the earth. And to him was given the key of the bottomless pit.

Revelation 12:9

And the great dragon, that old serpent called the devil and Satan; Was cast out. Which deceiveth all the world. And he was cast into the earth, and his angels were cast out also.

Treasury of Scripture Knowledge

Summary

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.

The angel

Abaddon

Bible References

They had

Revelation 12:9
And the great dragon, that old serpent called the devil and Satan; Was cast out. Which deceiveth all the world. And he was cast into the earth, and his angels were cast out also.
John 12:31
Now is the judgment of this world: now shall the prince of this world be cast out a doors.
John 14:30
Hereafter will I not talk many words unto you. For the chief ruler of this world cometh, and hath nought in me.
John 16:11
And of judgment, because the chief ruler of this world is judged already.
2 Corinthians 4:4
in whom the God of this world hath blinded the minds of them which believe not, lest should shine unto them the light of the glorious gospel of Christ, which is the image of God.
Ephesians 2:2
in the which, in time past, ye walked, according to the course of this world, and after the governor that ruleth in the air, the spirit that now worketh in the children of unbelief,
1 John 4:4
Little children, ye are of God, and have overcome them: for greater is he that is in you, than he that is in the world.
1 John 5:19
We know that we be of God, and that the world is altogether set on mischief.

The angel

Revelation 9:1
And the fifth angel blew, and I saw a star fall from heaven unto the earth. And to him was given the key of the bottomless pit.

Abaddon

John 8:44
Ye are of your father the devil, and the lusts of your father, ye will do. He was a murderer from the beginning; And abode not in the truth, because there is no truth in him. When he speaketh a lie, then speaketh he of his own. For he is a liar, and the father thereof.