Marcus Aurelius (121-180 AD) is one of the great figures of antiquity who still speaks to us today, more than two thousand years after his death. His Meditations has been compared by John Stuart Mill to the Sermon on the Mount. A guide to how we should live, it remains one of the most widely read books from the classical world. But Marcus Aurelius was much more than a philosopher. As emperor he stabilized the empire, issued numerous reform edicts,...