The book is dedicated to the pivotal events of Russian history of the 14th - early 17th centuries - from the Battle of Kulikovo to the period of the Time of Troubles. It explores the role of the clergy in these events and reveals the relationship between secular and ecclesiastical authorities. Having chosen the biographical genre, the author gives vivid biographies of outstanding church figures of Russia. The book was written by the famous historian R. G. Skrynnikov, author of the books “Ivan the Terrible”, “Boris Godunov”, “Minin and Pozharsky”, “Hard Years” and others. The book is designed to the widest range of readers.