Revelation 9:11

They have over them a king, the angel of the abyss, whose name in the Hebrew tongue is Abaddon, but in the Greek he hath for his name Apollyon.

Ephesians 2:2

in which ye once walked according to the course of this world, according to the prince of the powers of the air, the spirit that is now working in the sons of disobedience;

John 8:44

Ye are of your father the Devil, and what your father desireth ye are ready to do. He was a murderer from the beginning; and he abideth not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh from his own nature; for he is a liar, and the father of it.

John 12:31

Now is the judgment of this world; now will the prince of this world be cast out;

John 14:30

I shall not talk much more with you. For the prince of the world cometh, and hath nothing in me.

John 16:11

of judgment, because the prince of this world hath been judged.

2 Corinthians 4:4

in whom the God of this world blinded the understandings of the unbelieving, so that they cannot behold the light of the gospel of the glory of Christ, who is the image of God.

1 John 4:4

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

1 John 5:19

We know that we are of God, and the whole world lieth under the dominion of the Evil One.

Revelation 9:1-2

And the fifth angel sounded, and I saw a star fallen out of heaven to the earth, and to him was given the key of the pit of the abyss;

Revelation 12:9

And the great dragon was cast down, the old serpent, called the Devil and Satan, who deceiveth the whole world; he was cast down to the earth, and his angels were cast down 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 down, the old serpent, called the Devil and Satan, who deceiveth the whole world; he was cast down to the earth, and his angels were cast down with him.
John 12:31
Now is the judgment of this world; now will the prince of this world be cast out;
John 14:30
I shall not talk much more with you. For the prince of the world cometh, and hath nothing in me.
John 16:11
of judgment, because the prince of this world hath been judged.
2 Corinthians 4:4
in whom the God of this world blinded the understandings of the unbelieving, so that they cannot behold the light of the gospel of the glory of Christ, who is the image of God.
Ephesians 2:2
in which ye once walked according to the course of this world, according to the prince of the powers of the air, the spirit that is now working in the sons of disobedience;
1 John 4:4
Ye are of God, my children, and have overcome them; because greater is he that is in you, than he that is in the world.
1 John 5:19
We know that we are of God, and the whole world lieth under the dominion of the Evil One.

The angel

Revelation 9:1
And the fifth angel sounded, and I saw a star fallen out of heaven to the earth, and to him was given the key of the pit of the abyss;

Abaddon

John 8:44
Ye are of your father the Devil, and what your father desireth ye are ready to do. He was a murderer from the beginning; and he abideth not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh from his own nature; for he is a liar, and the father of it.