Revelation 16:12

The sixth poured out his bowl on the great river Euphrates, and its waters were dried up to prepare the way for the kings from the east.

Revelation 17:13

they are of one mind, and they confer their power and authority upon the Beast.

Revelation 19:19-21

And I saw the Beast and the kings of earth and their troops mustered to wage war on him who was seated on the horse and on his troops.

Treasury of Scripture Knowledge

Summary

But tidings out of the east and out of the north shall trouble him: therefore he shall go forth with great fury to destroy, and utterly to make away many.

Bible References

East

Revelation 16:12
The sixth poured out his bowl on the great river Euphrates, and its waters were dried up to prepare the way for the kings from the east.
Revelation 17:13
they are of one mind, and they confer their power and authority upon the Beast.
Revelation 19:19
And I saw the Beast and the kings of earth and their troops mustered to wage war on him who was seated on the horse and on his troops.