The new profession of the delator must have given a stimulus to oratory.
avKoc/avr1]s), in ancient Greece the counterpart of the Roman delator, a public informer.
DELATOR, in Roman history, properly one who gave notice (deferre) to the treasury officials of moneys that had become due to the imperial fisc. This special meaning was extended to those who lodged information as to punishable offences, and further, to those who brought a public accusation (whether true or not) against any person (especially with the object of getting money).
Although the word delator itself, for "common informer," is confined to imperial times, the right of public accusation had long been in existence.