The boni, the wealthy, but largely non-political, section of the Roman elite, have hitherto escaped scholarly attention. This book draws a detailed and rounded picture of the boni, their identity, values and interests, also tracing their - often tense - relationship to the political class, whose inner circle of noble families eventually lost their trust and support. Concerns about property played a central part in this process, and the book explores key Roman concepts associated with property, including frugality, luxury, patrimony, debt and the all-important otium that ensured the peaceful enjoyment of private possessions. Through close readings of Cicero and other republican writers, a new narrative of the 'fall of the republic' emerges. The shifting allegiances of the wider elite of boni viri played an important part in the events that brought an end to the republic and ushered in a new political system better attuned to their material interests.