"The History of Frederick II of Prussia - Volume 09" by Thomas Carlyle is a fascinating study of the life and work of the great Prussian king. In this book, the author examines in detail the events that influenced the formation of the years of Frederick II's reign, and reveals his complex personality. Carley successfully combines historical facts with philosophical reflections, as a result of which the reader receives a complete and in-depth overview of the era in which Frederick II lived and ruled. This book is an important source for those interested not only in the history of Prussia, but also in the philosophy of government and society of the 18th century.