'King of Kings' in the Bible

Artaxerxes, king of kings, unto Ezra the priest, a scribe of the law of the God of heaven, perfect peace, and at such a time.

For thus saith the Lord GOD; Behold, I will bring upon Tyrus Nebuchadrezzar king of Babylon, a king of kings, from the north, with horses, and with chariots, and with horsemen, and companies, and much people.

Thou, O king, art a king of kings: for the God of heaven hath given thee a kingdom, power, and strength, and glory.

to keep your commission free from stain, free from reproach, till the appearance of our Lord Jesus Christ ??15 which will be brought about in due time by that blessed and only Sovereign, King of kings and Lord of lords,

Which in his times he shall shew, who is the blessed and only Potentate, the King of kings, and Lord of lords;

They were singing the song of Moses, the slave of God, and the song of the Lamb, saying. "Great and marvelous are thy works, O Lord God, the Almighty! Righteous and true are thy ways, Thou King of kings!

These shall make war with the Lamb, and the Lamb shall overcome them: for he is Lord of lords, and King of kings: and they that are with him are called, and chosen, and faithful.

And he hath on his vesture and on his thigh a name written, KING OF KINGS, AND LORD OF LORDS.