Three heroes and the Crown Princess

The Prince of Kiev decided to appoint an heir to the throne, but here's the problem - who can it be? A relative, a family friend, or maybe an overseas princess? Without thinking twice, the Prince-father chooses almost a princess, and most importantly a relative, his niece Zabava. Today she is together with her husband Elisha (do you remember Dobrynya Nikitich's faithful disciple?) He is educated in distant Constantinople, where the treacherous Basileus rules. In order to return the heiress to her native lands, three heroes and, of course, the main court horse, Julius, are hurriedly sent to distant lands.