'King of Kings' in the Bible

“Artaxerxes, king of kings, to Ezra the priest, the scribe of the Law of the God of heaven, perfect peace (greetings). And now

For thus says the Lord God, “Behold, I will bring upon Tyre from the north Nebuchadnezzar the king of Babylon, king of kings, with horses and chariots and with horsemen and a great army.

which He will bring about in His own time—He who is the blessed and only Sovereign [the absolute Ruler], the King of those who reign as kings and Lord of those who rule as lords,

They will wage war against the Lamb (Christ), and the Lamb will triumph and conquer them, because He is Lord of lords and King of kings, and those who are with Him and on His side are the called and chosen (elect) and faithful.”

And on His robe and on His thigh He has a name inscribed, “KING OF KINGS, AND LORD OF LORDS.”