Who is called king of kings in the book of Ezra?

And all Israel that were round about them fled at the cry of them: for they said, Lest the earth swallow us up also. Numbers 16:34

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. Ezra 7:14

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