Boris Nikolaevich Bugaev (Russian:Бори́с Никола́евич Буга́ев;IPA: [bɐˈrʲis nʲɪkɐˈlajɪvʲɪtɕ bʊˈɡajɪf]), better known by the pen name Andrei Bely (Russian:Андре́й Бе́лый;IPA: [ɐnˈdrʲej ˈbʲelɨj]; 26 October [O.S. 14 October] 1880 – 8 January 1934), was a Russian novelist, poet, theorist, and literary critic. His novel Petersburg was regarded by Vladimir Nabokov as one of the four greatest novels of the 20th century.