Meditations is a series of personal reflections by Marcus Aurelius, Roman Emperor 161–180 CE, written over a series of years in far-flung places as he led the Romans in military campaigns, quashed revolts, and dealt with the other tribulations of governing the Empire. It is best described as a spiritual journal, containing a record of the emperor's philosophical exercises. He covers topics as diverse as the question of virtue, human rationality, the nature of the gods, and his own emotions, spanning from doubt and despair to conviction and exaltation. Aurelius also sets forth his ideas on Stoic philosophy.