How was the traveller linked to ozymandias in the poem for Percy Shelley?

In Percy Shelley's poem "Ozymandias," the traveller is linked to Ozymandias through the story he tells about finding a ruined statue in the desert. The traveller's description of the statue and the inscription on it reveal the once-great power and arrogance of Ozymandias, the king depicted in the statue. The traveller's account serves to showcase the transient nature of human achievements and the inevitable decay of even the mightiest empires.