I know it's not medieval, but it's so amazing. The Beryozka or Berezka Dance Ensemble (beroyzka= Russian for little birch tree) is a troupe of female dancers founded by Russian choreographer and dancer Nadezhda Nadezhdina in 1948 in the Soviet Union which specializes in performing in long gowns and moving across the stage as though on wheels or floating. Although often considered a form of folk dancing, its founder once stated, "Beryozka's dances are not folk dances. They are dances whose source

Berezka Russian Gliding Floating Dance