Revelation 9:11

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

Ephesians 2:2

in which at one time you walked about according to the age of this world, according to the prince of the power of the air, the spirit which is now working in the sons of disobedience;

John 8:44

You are of your father the devil, and you wish to do the lusts of your father. He was a murderer from the beginning, and stood not in the truth, because there was no truth in him. When he may speak a lie, he speaks of his own: because he is a liar, and the father of the same.

John 12:31

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

John 14:30

I shall no longer speak many things with you, because the prince of the world comes: and he has nothing in me;

John 16:11

and concerning judgment, because the prince of this world has been condemned.

2 Corinthians 4:4

in whom the god of this age has blinded the minds of those who believe not, in order that the light of the gospel of the glory of Christ, who is the image of God, may not shine on them.

1 John 4:4

You are of God, little children, and you have conquered them; because he who is in you is greater than he who is in the world.

1 John 5:19

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

Revelation 9:1-2

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

Revelation 12:9

And the great dragon, the old serpent, the one called the devil, and Satan, the one deceiving the whole world, was cast out: he was cast out 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, the old serpent, the one called the devil, and Satan, the one deceiving the whole world, was cast out: he was cast out into the earth, and his angels were cast out with him.
John 12:31
Now is the judgment of this world: now the prince of this world shall be cast out.
John 14:30
I shall no longer speak many things with you, because the prince of the world comes: and he has nothing in me;
John 16:11
and concerning judgment, because the prince of this world has been condemned.
2 Corinthians 4:4
in whom the god of this age has blinded the minds of those who believe not, in order that the light of the gospel of the glory of Christ, who is the image of God, may not shine on them.
Ephesians 2:2
in which at one time you walked about according to the age of this world, according to the prince of the power of the air, the spirit which is now working in the sons of disobedience;
1 John 4:4
You are of God, little children, and you have conquered them; because he who is in you is greater than he who is in the world.
1 John 5:19
We know that we are of God, and the whole world lies in the evil one.

The angel

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

Abaddon

John 8:44
You are of your father the devil, and you wish to do the lusts of your father. He was a murderer from the beginning, and stood not in the truth, because there was no truth in him. When he may speak a lie, he speaks of his own: because he is a liar, and the father of the same.