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In The Avinu Malkeinu prayer, it says, "We have no King other than you", what about the House of David/Mashiach?
I guess, it's speaking only about hashem as an ultimate king from the beginning of the times till the end.
Only G-d is a truly omnipotent king. All other rulers are ultimately under the control of G-d as it says "Lev melachim beyad Hashem"