There is evidence that Prometheus Bound was the first play in a trilogy conventionally called the Prometheia, but the other two plays, Prometheus Unbound and Prometheus the Fire-Bringer, survive only in fragments. In Prometheus Unbound, Heracles frees Prometheus from his chains and kills the eagle that had been sent daily to eat the Titan's perpetually regenerating liver. Perhaps foreshadowing his eventual reconciliation with Prometheus, we learn that Zeus has released the other Titans whom he imprisoned at the conclusion of the Titanomachy. In Prometheus the Fire-Bringer, the Titan finally warns Zeus not to lie with the sea nymph Thetis, for she is fated to give birth to a son greater than the father. Not wishing to be overthrown, Zeus would later marry Thetis off to the mortal Peleus; the product of that union will be Achilles, Greek hero of the Trojan War. Grateful for the warning, Zeus finally reconciles with Prometheus.
This content is from Wikipedia. GradeSaver is providing this content as a courtesy until we can offer a professionally written study guide by one of our staff editors. We do not consider this content professional or citable. Please use your discretion when relying on it.