Shelley completed '' Prometheus Unbound '' in Rome , and he spent mid-1819 writing a tragedy , '' The Cenci '' , in Leghorn ( Livorno ) . In this year , prompted among other causes by the Peterloo Massacre , he wrote his best-known political poems : '' The Masque of Anarchy '' and '' Men of England . '' These were probably his best-remembered works during the 19thcentury . Around this time period , he wrote the essay '' The Philosophical View of Reform '' , which was his most thorough exposition of his political views to that date
Peterloo Massacre
Peterloo Massacre
Percy Bysshe Shelley