Ezra 7:12
Artaxerxes, king of kings, to Ezra the priest, a scribe of the law of the God of heaven, perfect peace, and at such a time.
Nave's Topical Index—AKJV

Ezekiel 26:7
For thus said the Lord GOD; Behold, I will bring on 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.
Nave's Topical Index—AKJV

Daniel 2:37
You, O king, are a king of kings: for the God of heaven has given you a kingdom, power, and strength, and glory.
Nave's Topical Index—AKJV