The author has identified more than 400 manuscripts in the archival repositories of Russia and other countries containing information about the life and miracles of St. Sergius of Radonezh, the most revered Russian saint. New editions of the texts of the Life of Sergius have been opened, introduced into scientific circulation for the first time. New facts from the biography of Sergius are presented, data on the monastic reform in Rus' in the 14th century. The problem of the origin of Rublev's "Trinity" has been solved. The content of the work of the greatest ancient Russian writer Epiphanius the Wise is fully revealed. The famous Trinity Literary School has been replenished with new names of first-class masters. The book also contains the publication of the most important editions of the Life of Sergius of Radonezh. Original pdf -The text of the book was translated from the original language using an artificial intelligence program. For the most part, the translation of the text is of very high quality, but in some cases, due to the imperfection of the technology, there may be incorrect phrase translations in the text, as well as single words and expressions may not be translated.