...or Kashchei, or Kostchtchie, or
Koshchei the Deathless. In
Igor Stravinsky's ballet,
The Firebird, an immortal ogre (like
Baba Yaga, I assume) who has imprisoned
13 enchanted princesses (or is that,
enchanted 13
imprisoned
princesses?)
In 1st Edition AD&D, Kostchtchie is the name given the Demon Lord of Ogres (in Monster Manual II). Some sources indicate that Kostchtchie is specific to the Greyhawk setting. His Gloranthan cognate would be Cacodemon.