IV century BC e. The Macedonian king Philip, a skilled commander and far-sighted politician, wooed the Epirus princess Myrtala. The king needs an heir to the royal blood, however, despite the absence of visible obstacles to the marriage, the matter is delayed. The Epirus king Arriba, the bride's uncle, is nervous. It seems that the marriage will not take place at all, but the great god Zeus has already made a decision and expresses his will through signs. After the wedding, Myrtala will have a son, Alexander, whom Philip will declare as his own, but a truly great future awaits the child, so many will wonder who was born to Philip’s wife - a man or a demigod, the son of Zeus himself...