Because of an oath sworn by Zeus that he wouldn't release Prometheus, the Titan must wear a fragment of the rock attached to a steel ring.

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This is true according to Greek mythology, as punishment for stealing fire from the gods and giving it to humans, Prometheus was chained to a rock and had an eagle come to eat his liver each day. Zeus had sworn an oath not to release him, so he continued to suffer until he was eventually freed by Heracles.

Because of an Oath Sworn by Zeus That He Wouldn't