It is to be feared that the greater part of the Histories of Tacitus is lost beyond recall: Latin literature appears but rarely among the treasures of the sands of Egypt. The consequent gap in our knowledge is very imperfectly filled by the records that do remain. It is certain that many events of importance have been wholly passed over in them, while many others are referred to in such an incidental and cursory way that varying interpretations seem possible, and conjecture becomes permissible and even necessary.
We know in general that Vespasian was an energetic reformer and reorganiser: it may be possible, even with our fragmentary evidence, to trace his reorganisation of the two wealthiest provinces, Asia and Africa, somewhat more fully than has hitherto been done. With regard to Asia, the conjecture seems justifiable that Eprius Marcellus was Vespasian's agent for reform, and that his prolonged tenure of the proconsulship of Asia is to be so explained. And in Africa, there may be some reason for supposing that Q. Vibius Crispus performed a similar service, and that his proconsulship there was similarly extended.