The terribly sad princess (1968)

Musical fairy tale tells the story of prince and princesses from neighbouring friendly countries who have to marry each other, as decided by their wise fathers with their advisors. However, the royal children want to decide their fate themselves. They meet in the royal garden, where princess pretends to be a maid and prince to be a herdsman. Prince under cover is imprisoned and helps princess with rebellion. She becomes sad all the time, because she does not want to marry anyone. Luckily, love finds way to their life . . .