Instruct: Classify Amazon reviews into positive or negative sentiment
Query: End of an era

The author researches and analyses this difficult and chaotic year in roman history by relying mostly on the writings of Tacitus, without disregarding other sources. The book is a scholarly and clear explanation how and important shift in governance came to pass, when a divided and powerless senate and a discontent pretorian guard had to cede decisionmaking to the legions stationed outside of Rome herself and rule by soldier-emperors ensued