In _Prometheus Unbound_ Shelley uses the old myth of the Titan who rebelled against the tyranny of the gods, and who was punished by being chained to a rock. [Footnote: The original tragedy of _Prometheus Bound_ was written by Æschylus, a famous old Greek dramatist. The same poet wrote also _Prometheus Unbound_, but the latter drama has been lost. Shelley borrowed the idea of his poem from this lost drama.] In this poem Prometheus (man) is represented as being tortured by Jove (law or custom) until he is released by Demogorgon (progress or necessity); whereupon he marries Asia (love or goodness), and stars and moon break out into a happy song of redemption. Obviously there is no reality or human interest in such a fantasy. The only pleasurable parts of the poem are its detached passages of great melody or beauty; and the chief value of the work is as a modern example of Titan literature. Many poets have at various times represented mankind in the person of a Titan, that is, a man written large, colossal in his courage or power or suffering: Æschylus in _Prometheus_, Marlowe in _Tamburlaine_, Milton in Lucifer, of _Paradise Lost_, Goethe in _Faust_, Byron in _Manfred_, Shelley in _Prometheus Unbound_. The Greek Titan is resigned, uncomplaining, knowing himself to be a victim of Fate, which may not be opposed; Marlowe's Titan is bombastic and violent; Milton's is ambitious, proud, revengeful; Goethe's is cultured and philosophical; Byron's is gloomy, rebellious, theatrical. So all these poets portray each his own bent of mind, and something also of the temper of the age, in the character of his Titan. The significance of Shelley's poem is in this: that his Titan is patient and hopeful, trusting in the spirit of Love to redeem mankind from all evil. Herein Shelley is far removed from the caviling temper of his fellow rebel Byron. He celebrates a golden age not of the past but of the future, when the dream of justice inspired by the French Revolution shall have become a glorious reality. [Sidenote: HIS BEST POEMS] These longer poems of Shelley are read by the few; they are too vague, with too little meaning or message, for ordinary readers who like to understand as well as to enjoy poetry. To such readers the only interesting works of Shelley are a few shorter poems: "The Cloud," "To a Skylark," "Ode to the West Wind," "Indian Serenade," "A Lament," "When the Lamp is Lighted" and some parts of _Adonais_ (a beautiful elegy in memory of Keats), such as the passage beginning, "Go thou to Rome." For splendor of imagination and for melody of expression these poems have few peers and no superiors in English literature. To read them is to discover that Shelley was at times so sensitive, so responsive to every harmony of nature, that he seemed like the poet of Alastor, A fragile lute, on whose harmonious strings The breath of Heaven did wander.