The most famous version of the Firebird legend was the production by Sergei Diaghilev of Ballet Russe, who commissioned composer Igor Stravinsky to score the enormously popular large-scale ballet called "The Firebird". In Stravinsky's ballet, with a scenario written by Michel Fokine and Alexandre Benois, the creature is half-woman, half-bird. She is captured by Prince Ivan, but when he sets her free she gives him a magic feather, which he uses to defeat the spell of Kaschei the Immortal, who had captured thirteen princesses. Prince Ivan then marries the most beautiful of them.