How long did the Tatar-Mongol yoke last? Who was the author of "The Words about Igor's Regiment"? Who called Prince Alexander Nevsky, and Prince Yaroslav Wise? Anton Gorsky, Doctor of Historical Sciences, Chief Researcher at the Institute of Russian History of the Russian Academy of Sciences, answers these and many other questions. In the book "Russian Middle Ages," the author restores historical justice and debunks some myths of the so-called alternative history. The views of A. Gorsky in some cases differ from the officially recognized ones, so immersion in medieval Russia becomes even more interesting.