The importance of these letters is easily explained. The politicians of those times had more need of correspondence with each other than those of the present day. The proconsul starting from Rome to govern some distant province felt that he was withdrawing altogether from political life.
To pass several years in those out-of-the-way countries which the public rumour of Rome did not reach, was very irksome to men accustomed to the stir of business, the agitations of parties, or, as they said, the broad daylight of the Forum…The Roman journal contained a rather tame official report of public meetings, a short summary of important cases tried in the Forum, besides an account of public ceremonies and accurate notice of atmospheric phenomena or prodigies occurring in Rome or its neighbourhood..…
They chose a few trustworthy and well-informed friends of good position, and through them learnt the reason and the real character of the facts reported dryly and without comment by the journals; and while their paid correspondents gave them only the talk of the town, the others introduced them into the cabinets of the high politicians, and made them listen to their most private conversations.