Dio Cassius "History of Rome" LXXVIII.9 But these taxes would probably have been outweighed by the loss of the annual poll tax previously paid by "peregrini", from which as Roman citizens they would now be exempt.
Dio Cassius "History of Rome" LXXVIII.9 But these taxes were a relatively minor source of imperial revenues. They would have been greatly outweighed by the loss of the annual poll tax previously paid by "peregrini", from which as Roman citizens they would now be exempt.