In this book, the authors talk about two most important milestones in historical chronology - the dating of the Nativity of Christ and the First Ecumenical Council in Nicaea, on which Scaliger's chronological version is largely based. And they show that both dates are determined completely incorrectly. The book details exactly how both of these fundamental dates were calculated and what errors were made in doing so. And what’s most interesting is what dates you get if the errors are corrected. About what was the true reason for the famous Gregorian calendar reform of the 16th century, after which two styles were formed in our calendar - “old” and “new”. They also talk in detail about the reflections of the Gospel events in the phantom history of Italian Rome supposedly of the 11th century AD, which, in fact, was founded no earlier than the 14th century AD, and was never the capital of that famous “ancient Roman Empire”, which we all know about from school. And much more that will not leave indifferent any reader interested in Russian and world history.