Sivko-Burko
Sivko-Burko (Russian: Сивко-бурко, romanized: Sivko-burko) is a Russian fairy tale (skazka) collected by folklorist Alexandr Afanasyev in his three-volume compilation Russian Fairy Tales. The tale is a local form in Slavdom of tale type ATU 530, "The Princess on the Glass Mountain", wherein the hero has to jump higher and reach a tower or terem, instead of climbing up a steep and slippery mountain made entirely of glass.