Ozymandias- he thinks of himself as the big shot. He boasts about his work(look upon my works and ur might despair). Ozymandias has this aroma of arrogance on his pedestal he proclaims to be the (king of kings) and warns other rulers or his enemies to be sad-(despair).
He thought that the statue and his work will forever immortalise him and he shall be the king of kings but now it's all just a (colossal wreck) all the power he might have once had, all his accomplishments are now (lone and level) - this suggests that he is no longer a feared ruler but just a pile of rubble in the middle of nowhere.
The whole poem it self is mocking ozymandias that his work is no longer there his is no longer the King of kings.
