Сказка о царе Салтане
The lengthy full title of both the opera and the poem is "The Tale of Tsar Saltan, of his Son the Renowned and Mighty Bogatyr Prince Gvidon Saltanovich and of the Beautiful Princess-Swan" ( "Skazka o tsare Saltane, o syne yego slavnom i moguchem bogatyre knyaze Gvidone Saltanoviche i o prekrasnoy tsarevne Lebedi").