Marcus Aurelius was a Roman emperor and a prominent Stoic philosopher. Born in AD 121, he ruled the Roman Empire from AD 161 until his death in AD 180. Marcus Aurelius is best known for his philosophical work "Meditations," which serves as a personal journal and a guide to living a virtuous life. He believed in the importance of self-discipline, introspection, and the pursuit of wisdom. Marcus Aurelius taught that true happiness lies in accepting the natural order of the universe, practicing virtue, and maintaining inner tranquility amidst life's challenges. He emphasized the importance of living in accordance with reason, treating others with kindness and fairness, and recognizing the impermanence of worldly possessions. Marcus Aurelius' writings have had a lasting impact on Stoic philosophy and continue to offer valuable insights into leading a meaningful and virtuous life.