Second half of the 9th century. Europe is going through a period of feudal fragmentation, the empire of Charlemagne has broken up into several warring kingdoms. And at this time, the rulers of the North - the kings of Denmark and Norway - are gradually gaining strength. One of them, Harald Horfager - perhaps the most influential, decided to do the impossible: to unite the scattered lands of the Norwegians under his rule, sealed by a new faith. And in the web of these formidable events, the story of the young Viking Olaf, the son of a Norwegian jarl and a Slavic princess, is woven with an almost invisible thread. for whom fate has prepared a very difficult role...