The Third Prince (1983)

Once upon a time there was a prince, Jaroslav, whose two other brothers had fallen in love with a beautiful yet mysterious princess from a painting. His brothers had gone far away to seek her, however they never came back from their journey. And so the third prince went on a journey himself to find his brothers and came to a kingdom near the Diamond Mountain. There he found the beautiful princess and also his enchanted brothers. To break the spell, the prince is to succeed in the accomplishment of three difficult tasks. Will he succeed ?