Dio Chrysostom was a Greek philosopher and orator who lived during the Roman Empire, around 40 to 120 CE. He was born in Prusa, a city in Bithynia, and is best known for his eloquent speeches and writings, which often addressed moral and social issues of his time. Dio was a prominent figure in the Stoic philosophical tradition and traveled extensively, delivering public lectures across the empire. His works, known as the Discourses, cover a wide range of topics, including ethics, politics, and the nature of happiness. Dio's style is characterized by its clarity and persuasive power, making his ideas accessible to a broad audience. He also emphasized the importance of virtue and the role of the individual in society.