Short answers, pulled from the story.
Eleven fragments survive from Prometheus Unbound, preserved by later authors who quoted the 5th-century BC Greek tragedian Aeschylus. These scraps form the only direct evidence for the play's content and structure.
A lengthy fragment translated into Latin by the Roman statesman Cicero indicates that the play opened with Prometheus visited by a chorus of Titans. This specific Latin rendering serves as a primary source for understanding how the play began.
Heracles kills the eagle that had been torturing Prometheus by eating his regenerating liver every day to free the Titan from his eternal punishment. Heracles' intervention marks the physical liberation of the suffering figure.
Percy Bysshe Shelley wrote a play titled Prometheus Unbound inspired by Aeschylus's lost tragedy during the 19th century. His version reimagines the original mythological conflict through a new literary lens.