"The Thirteenth, the Greatest of Ages" is a famous book by the American historian James J. Welsh, which reveals the period of the Middle Ages, considering it the most perfect in human history. The author examines in detail the religious, cultural, social and scientific achievements of the 13th century, which made a great contribution to the development of civilization. The book inspires the reader to rethink views on the Middle Ages and evaluate the impact of this period on the further development of mankind. "The Thirteenth, the Greatest of Centuries" is a fascinating journey into a unique era that will leave an indescribable mark in the hearts of everyone who immerses himself in its pages.