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'."