School historian Nikolay Bulytsky—back in the distant past. Alone, without weapons, in the world of Ancient Rus, our not-so-young modern man is ready, with word and deed, to stand in the way of Mongol hordes. Not everyone likes the “industrialization” he has envisioned in the 14th century, but the man who won the patronage of Dmitry Donskoy and Sergiy of Radonezh is capable of much more…