was the personal role played by Dio of Prusa in his relationship with Trajan. Dio is described by Philostratus as Trajan's close friend, and Trajan as supposedly engaging publicly in conversations with Dio. Nevertheless, as a Greek local magnate with a taste for costly building projects and pretensions of being an important political agent for Rome, Dio of Prusa was actually a target for one of Trajan's authoritarian innovations: the appointing of imperial correctores to audit the civic finances of the technically free Greek cities. The main goal was to curb the overenthusiastic spending on public works that served to channel ancient rivalries between neighbouring cities. As Pliny wrote to Trajan, this had as its most visible consequence a trail of unfinished or ill-kept public utilities. Competition among Greek cities and their ruling oligarchies was mainly for marks of pre-eminence, especially for titles bestowed by the Roman emperor. Such titles were ordered in a ranking system that determined how the cities were to be outwardly treated by Rome. The usual form that such rivalries took was that of grandiose building plans, giving the cities the opportunity to vie with each other over "extravagant, needless... structures that would make a show". A side effect of such extravagant spending was that junior and thus less wealthy members of the local oligarchies felt disinclined to present themselves to fill posts as local magistrates, positions that involved ever-increasing personal expense. Roman authorities liked to play the Greek cities against one anothersomething of which Dio of Prusa was fully aware: These same Roman authorities had also an interest in assuring the cities' solvency and therefore ready collection of Imperial taxes. Last but not least, inordinate spending on civic buildings was not only a means to achieve local superiority, but also a means for the local Greek elites to maintain a separate cultural identitysomething expressed in the contemporary rise of the Second Sophistic; this "cultural patriotism" acted as a kind of substitute for the loss of political independence, and as such was shunned by Roman authorities. As Trajan himself wrote to Pliny: "These poor Greeks all love a gymnasium... they will have to content with one that suits their real needs". The first known corrector was charged with a commission "to deal with the situation of the free cities", as it was felt that the old method of ad hoc intervention by the Emperor and/or the