In my dissertation I explain Cicero's philosophical works through an analysis of his epistolary interactions and literary rivalries with Roman Epicureans. I argue that this historical and intellectual context reveals how Cicero's overt and consistent anti-Epicurean polemics constitute a fundamental organizing principle of his philosophical works; Epicureanism is the philosophical Other against which the dialogues define themselves. The first two chapters of my thesis reconstruct Cicero's social and friendship networks of Roman Epicureans and literary rivals; to that end I offer a series of prosopographical charts designed to replace the now dated Prosopography of Roman Epicureans by Catherine Castner. The second half of my thesis uses th...