Determinism and Freedom in Stoic Philosophy is the first comprehensive study of one of the most important intellectual legacies of the ancient Greek world: the Stoic theory of causal determinism. The book identifies the main problems that the Stoics addressed and reconstructs the theory, andexplores how they squared their determinism with their conceptions of possibility, action, freedom, and moral responsibility, and how they defended it against objections and criticism by other philosophers. It shows how the Stoics distinguished their causal determinism from ancient theories oflogical determinism, fatalism, and necessitarianism. Along the way an authoritative account is given of many other related aspects of Stoic thought, including their views on the predictability of the future, the role of empirical sciences, the determination of character, and moral freedom. Bobzien'sstudy of these central doctrines of Stoicism reveals the considerable philosphical richness and power that they retain today.