I met a traveller from an antique land
Who said: Two vast and trunkless legs of stone
Stand in the desert...Near them, on the sand,
Half sunk, a shattered visage lies, whose frown,
And wrinkled lip, and sneer of cold command,
Tell that its sculptor well those passions read
Which yet survive, stamped on these lifeless things,
The hand that mocked them, and the heart that fed:
And on the pedestal these words appear:
"My name is Ozymandias, king of kings:
Look at my works, ye Mighty and despair!"
Nothing beside remainsl Round the decay
Of that colossal wreck, boundless and bare
The lone and level sands stretch far away.
-Percy Bysshe Shelley
Ozy comes from the Greek "ozium," which means to breath, or air. Mandias comes from the Greek "mandate," which means to rule. Hence, Ozymandias is simply a "ruler of air" or a "ruler of nothing". It is then obvious that the King of Kings spoken of in the poem is actually nature itself. Nature never disappears and nature represents immortality.
http://chelm.freeyellow.com/ozymandias1.html