One of his major works, "Dziady" (Forefathers' Eve), comprises several parts written over an extended period of time. It began with publication of parts II and IV in 1823. Miłosz remarks that it was "Mickiewicz's major theatrical achievement", a work which Mickiewicz saw as ongoing and to be continued in further parts. Its title refers to the pagan ancestor commemoration that had been practiced by Slavic and Baltic peoples on All Souls' Day. The year 1832 saw the publication of part III: much superior to the earlier parts, a "laboratory of innovative genres, styles and forms". Part III was largely written over a few days; the "Great Improvisation" section, a "masterpiece of Polish poetry", is said to have been created during a single inspired night. A long descriptive poem, ""Ustęp"" (Digression), accompanying part III and written sometime before it, sums up Mickiewicz's experiences in, and views on, Russia, portrays it as a huge prison, pities the oppressed Russian people, and wonders about their future. Miłosz describes it as a "summation of Polish attitudes towards Russia in the nineteenth century" and notes that it inspired responses from Pushkin ("The Bronze Horseman") and Joseph Conrad ("Under Western Eyes"). The drama was first staged by Stanisław Wyspiański in 1901, becoming, in Miłosz's words, "a kind of national sacred play, occasionally forbidden by censorship because of its emotional impact upon the audience." The Polish government's 1968 closing down of a production of the play sparked the 1968 Polish political crisis.