Mary Shelley evening, the discussions turned to the nature of the principle of life. "Perhaps a corpse would be re-animated", Mary noted, "galvanism had given token of such things". It was after midnight before they retired, and unable to sleep, she became possessed by her imagination as she beheld the "grim terrors" of her "waking dream", her ghost story: She began writing what she assumed would be a short story. With Percy Shelley's encouragement, she expanded this tale into her first novel, "Frankenstein; or, The Modern Prometheus", published in 1818. She later described that summer in Switzerland as the moment "when I
Prometheus him. Moreover, Aeschylus anachronistically and artificially injects Io, another victim of Zeus's violence and ancestor of Heracles, into Prometheus' story. Finally, just as Aeschylus gave Prometheus a key role in bringing Zeus to power, he also attributed to him secret knowledge that could lead to Zeus's downfall: Prometheus had been told by his mother Themis, who in the play is identified with Gaia (Earth), of a potential marriage that would produce a son who would overthrow Zeus. Fragmentary evidence indicates that Heracles, as in Hesiod, frees the Titan in the trilogy's second play, "Prometheus Unbound". It is apparently not until