Grand Duke Oleg the Prophet is one of the key figures in the early history of Ancient Rus' and at the same time one of the most mysterious. Many historians agree that Oleg is identical to one of the most popular heroes of the Scandinavian sagas - Orvar-Odd, also known as Odd the Arrow. The authors of the book, carefully studying domestic and foreign sources, try to understand the significant number of inconsistencies and mysteries that are present in abundance in these documents, sometimes coming to conclusions that are quite logical, but not always “in line” with established views on the past.