Exploring the “Mongol-Tatar” invasion, most researchers turned their attention to the East, strenuously “pulling by the ears” any eastern events to the affairs of Rus'. They were not deterred by either the vast distances or the lack of artifacts of the very existence of a huge empire. Let me remind you - a well-governed, greatest and richest empire that lasted centuries. Honored historians of past centuries who wrote similar reconstructions were undoubtedly smart and educated people, but they knew no maps, no distances, had neither the Internet nor a television. They had limited sources and a narrow worldview. The author is not going to argue with anyone. He describes events that really happened and had a pan-European resonance.