Revelation 17:10

There are also seven kings.  Five have fallen, one is, and the other has not yet come.  And when he comes, he must continue a short time.

Psalm 2:2  The kings of the earth set themselves, and the rulers take counsel together, against the LORD and against His Anointed..

Psalm 72:11  Yes, all kings shall fall down before Him; all nations shall serve Him.