Cicero is one of the most important and influential thinkers within the history of Western philosophy. For the last thirty years, his reputation as a philosopher has once again been on the rise after close to a century of very low esteem. This Companion introduces readers to 'Cicero the philosopher' and to his philosophical writings. It provides a handy port-of-call for those interested in Cicero's original contributions to a wide variety of topics such as epistemology, the emotions, determinism and responsibility, cosmopolitanism, republicanism, philosophical translation, dialogue, aging, friendship, and more. The international, interdisciplinary team of scholars represented in this volume highlights the historical significance and contemporary relevance of Cicero's writings, and suggests pathways for future scholarship on Cicero's philosophy as we move through the twenty-first century.

Ancient dialectic started as an art of refutation and evolved into a science akin to our logic, grammar and linguistics. Scholars of ancient philosophy have traditionally focused on Plato's and Aristotle's dialectic without paying much attention to the diverse conceptions and uses of dialectic presented by philosophers after the classical period. To bridge this gap, this volume aims at a comprehensive understanding of the competing Hellenistic and Imperial definitions of dialectic and their connections with those of the classical period. It starts from the Megaric school of the fourth century BCE and the early Peripatetics, via Epicurus, the Stoics, the Academic sceptics and Cicero, to Sextus Empiricus and Galen in the second century CE. The philosophical foundations and various uses of dialectic are closely analysed and systematically examined together with the numerous objections that were raised against them.