Marcus Aurelius (121-180 CE) was a Roman emperor and Stoic philosopher, renowned for his wisdom, virtue, and commitment to the principles of Stoicism. He is best known for his work "Meditations," a series of personal reflections and aphorisms that offer insights into his philosophical beliefs and his approach to life and governance. Marcus Aurelius emphasized the importance of self-discipline, rationality, and the pursuit of inner peace in the face of adversity. He believed in the universal brotherhood of humanity and promoted the cultivation of virtues such as wisdom, courage, and justice. As one of the "Five Good Emperors," his reign is remembered for its stability and benevolence.