Question

how does Ozymondias refer to himself as King of Kings

Answer 1

UNDER HIS HALF BROKEN STATUE THERE IS A PEDESTIAL WHERE IT IS WRITTEN THAT :"MY NAME IS OZYMANDIAS,THE KING OF  KINGS
                             LOOK ON MY WORKS,YE MIGHTY AND DESPAIR"
BY THESE WORDS OZYMANDIAS MEANS THAT HE IS VERY PROUD OF HIS KINGDOM AND HIS POWER WHICH NO MORE EXISTS IN THIS WORLD.
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Answer 2

ozymandias calls himself king of kings because he thinking that he can not be defeated by anyone,not even by God himself.it shows he was a proud and arrogant.