Revelation 9:11

And they have over them a king, the angel of the bottomless pit: his name in the Hebrew is Abaddon, but in the Greek he hath the name Apollyon.

Ephesians 2:2

who were dead in trespasses and sins, Wherein ye formerly walked, according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the sons of disobedience: Among whom also we all had our conversation in time past,

John 8:44

Ye are of your father the devil, and your will is, to do the desires of your father. He was a murderer from the beginning, and abode not in the truth; for there is no truth in him. When he speaketh a lie, he speaketh of his own; for he is a liar, and the father of it.

John 12:31

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

John 14:30

Hereafter I shall not talk much with with you; for the prince of this world is coming; but he hath nothing in me:

John 16:11

Of judgment, because the prince of this world is judged.

2 Corinthians 4:4

Whose unbelieving minds the god of this world hath blinded, lest the illumination of the glorious gospel of Christ, who is the image of God, should shine upon them.

1 John 4:4

Ye are of God, beloved children, and have overcome them; because greater is he that is in you, than he that is in the world.

1 John 5:19

but he that is born of God keepeth himself, and the wicked one toucheth him not. We know, that we are of God, and the whole world lieth in the wicked one.

Revelation 9:1-2

And the fifth angel sounded, and I saw a star falling from heaven upon the earth, and to him was given the key of the bottomless pit.

Revelation 12:9

And the great dragon was cast out, the antient serpent, who is called the devil and satan, who deceiveth the whole world: he was cast out unto the earth, and his angels were cast out with him.

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 was cast out, the antient serpent, who is called the devil and satan, who deceiveth the whole world: he was cast out unto the earth, and his angels were cast out with him.
John 12:31
Now is the judgment of this world: now shall the prince of this world be cast out.
John 14:30
Hereafter I shall not talk much with with you; for the prince of this world is coming; but he hath nothing in me:
John 16:11
Of judgment, because the prince of this world is judged.
2 Corinthians 4:4
Whose unbelieving minds the god of this world hath blinded, lest the illumination of the glorious gospel of Christ, who is the image of God, should shine upon them.
Ephesians 2:2
who were dead in trespasses and sins, Wherein ye formerly walked, according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the sons of disobedience: Among whom also we all had our conversation in time past,
1 John 4:4
Ye are of God, beloved children, and have overcome them; because greater is he that is in you, than he that is in the world.
1 John 5:19
but he that is born of God keepeth himself, and the wicked one toucheth him not. We know, that we are of God, and the whole world lieth in the wicked one.

The angel

Revelation 9:1
And the fifth angel sounded, and I saw a star falling from heaven upon 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 your will is, to do the desires of your father. He was a murderer from the beginning, and abode not in the truth; for there is no truth in him. When he speaketh a lie, he speaketh of his own; for he is a liar, and the father of it.