This is Atlas the Titan from Greek mythology.
Story: Atlas was one of the titans who fought in the war against the Olympians. when the titans lost the war, most were banished to Tartarus. However Atlas was condemned to hold up the heavens for all eternity.
There are different interpretations to what this means, I decided that Atlas holds up the universe, and if he were to drop it, everything will end including him. Which is why he doesn't just disobey Zeus.
The actual story is that Atlas holds up the sky to keep Ouranos (the sky) and Gaia (the earth) apart to prevent them from resuming their primordial embrace.
I have always loved mythology.