Revelation 9:11

And they have a king over them, the angel of the abyss, the name to him in Hebrew Abaddon, and in Greek he has the name Apollyon.

Ephesians 2:2

In which when ye walked according to the life of this world, according to the ruler of the power of the air, of the spirit now energetic in the sons of disobedience:

Job 26:6

Hades is naked before him, and no covering to destruction.

John 8:44

Ye are of your father the devil, and the eager desires of your father will ye do. He was slaying men from the beginning, and stood not in the truth, for there is no truth in him. When he would speak a lie, he speaks of his own things; for he is a liar, and the father of him.

John 12:31

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

John 14:30

I will no more speak much with you: for the ruler of this world comes, and has nothing in me.

John 16:11

And of judgment, for the ruler of this world has been judged.

2 Corinthians 4:4

In whom the God of this world blinded the minds of the unbelieving, so that the enlightening of the good news of the glory of Christ, who is the image of God, does not enlighten them.

1 John 4:4

Ye are of God, little children, and have conquered them: for greater is he in you, than he in the world.

1 John 5:19

We know that we are of God, and the whole world lies in evil.

Revelation 9:1-2

And the fifth angel sounded the trumpet, and I saw a star fallen from heaven to the earth: and there was given to him the key of the well of the bottomless pit.

Revelation 12:9

And the great dragon was cast out, the old serpent, called the Devil, and Satan, he deceiving the whole habitable globe: he was cast into 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 old serpent, called the Devil, and Satan, he deceiving the whole habitable globe: he was cast into the earth, and his angels were cast out with him.
John 12:31
Now is the judgment of this world: now shall the ruler of this world be cast out.
John 14:30
I will no more speak much with you: for the ruler of this world comes, and has nothing in me.
John 16:11
And of judgment, for the ruler of this world has been judged.
2 Corinthians 4:4
In whom the God of this world blinded the minds of the unbelieving, so that the enlightening of the good news of the glory of Christ, who is the image of God, does not enlighten them.
Ephesians 2:2
In which when ye walked according to the life of this world, according to the ruler of the power of the air, of the spirit now energetic in the sons of disobedience:
1 John 4:4
Ye are of God, little children, and have conquered them: for greater is he in you, than he in the world.
1 John 5:19
We know that we are of God, and the whole world lies in evil.

The angel

Revelation 9:1
And the fifth angel sounded the trumpet, and I saw a star fallen from heaven to the earth: and there was given to him the key of the well of the bottomless pit.

Abaddon

John 8:44
Ye are of your father the devil, and the eager desires of your father will ye do. He was slaying men from the beginning, and stood not in the truth, for there is no truth in him. When he would speak a lie, he speaks of his own things; for he is a liar, and the father of him.