Prometheus to be substantially discounted in preference to his own concerns for promoting his own version of an idealized consciousness of a society guided by the precepts of High British Romanticism and High British Idealism. "Frankenstein; or, the Modern Prometheus", written by Mary Shelley when she was 18, was published in 1818, two years before Percy Shelley's above mentioned play. It has endured as one of the most frequently revisited literary themes in twentieth century film and popular reception with few rivals for its sheer popularity among even established literary works of art. The primary theme is a parallel to the
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