The Slipper and the Rose (1976)
You'll forget every other love story you ever saw . . . or sang to.
Prince Edward wants to marry for love, but the King and court of the Kingdom of Euphrania are anxious for the Prince to wed no matter what. When the Prince meets Cinderella at a ball, he's sure she's the one, and when she loses her slipper upon exiting the dance, the Prince is determined to find and marry her.