This work relocates the origins of nineteenth-century social theory in classical Greece and focuses on three figures: Karl Marx, Max Weber, and Émile Durkheim, all of whom wrote dissertations on the culture and structure of ancient society. Greek philosophy, art, and politics inspired their ideas, stirred their imaginations, and defined their intellectual horizons. McCarthy rediscovers the forgotten dreams and classical horizons of these European social theorists and uncovers the close connections between sociology and philosophy, offering new insights into the methods, theories, and approaches of modern social science.