This thesis explores the intersection of the Roman conception of the state’s authority and the notion of fatherhood during the late Republic and early Principate. Its general conclusion is that the state’s authority in both periods was conceived of, in varying degrees, as patria potestas, which is the statutorily granted but legally unfettered power of the pater familias (Roman male head of household) over his dependents and property. It draws this conclusion first by defining fatherhood primarily in terms of patria potestas. It then examines two key works of the Republican statesman Cicero. In his De Re Publica, Cicero proposes the state as a transcendent institution whose justification is the human capacity to use reason (ratio). But...