Prometheus Unbound is a four-act lyrical drama by Percy Bysshe Shelley, first published in 1820. It is concerned with the torments of the Greek mythological figure Prometheus, who defies the gods and gives fire to humanity, for which he is subjected to eternal punishment and suffering at the hands of Zeus. It is inspired by the classical Prometheia, a trilogy of plays attributed to Aeschylus. Shelley's play concerns Prometheus' release from captivity, but unlike Aeschylus' version, there is no reconciliation between Prometheus and Jupiter (Zeus). Instead, Jupiter is abandoned by his supportive elements and falls from power, which allows Prometheus to be released. Shelley's play is a closet drama, meaning it was not intended to be produced on the stage. In the tradition of Romantic poetry, Shelley wrote for the imagination, intending his play's stage to reside in the imaginations of his readers. However, the play is filled with suspense, mystery and other dramatic effects that make it, in theory, performable. Background Mary Shelley, in a letter on 5 September 1818, was the first to describe her husband Percy Shelley's writing of Prometheus Unbound. On 22 September 1818, Shelley, while in Padua, wrote to Mary, who was at Este, requesting "The sheets of 'Prometheus Unbound,' which you will find numbered from one to twenty-six on the table of the pavilion." There is little other evidence as to when Shelley began Prometheus Unbound while he was living in Italy, but Shelley first mentions his progress in a letter to Thomas Love Peacock on 8 October 1818: "I have been writing – and indeed have just finished the first act of a lyrical and classical drama, to be called 'Prometheus Unbound'." Shelley stopped working on the poem following the death of his daughter Clara Everina Shelley on 24 September 1818. After her death, Shelley began to travel across Italy, and would not progress with the drama until after 24 January 1819. By April, the majority of the play was completed, and Shelley wrote to Peacock on 6 April 1819: "My Prometheus Unbound is just finished, and in a month or two I shall send it". Shelley also wrote to Leigh Hunt to tell him that the play was finished. However, the play was not yet published; Shelley would be delayed in editing and finishing the work by another death, that of his son William Shelley, who died on 7 June 1819. On