structural:scholar_edition
Noted author

During Nero's reign of terror, Pliny avoided working on any writing that would attract attention to himself. His works on oratory in the last years of Nero's reign (67–68) focused on form rather than on content. He began working on content again probably after Vespasian's rule began in AD 69, when the terror clearly was over and would not be resumed. It was to some degree reinstituted (and later cancelled by his son Titus) when Vespasian suppressed the philosophers at Rome, but not Pliny, who was not among them, representing, as he says, something new in Rome, an encyclopedist (certainly, a venerable tradition outside Italy).

In his next work, Bella Germaniae, Pliny completed the history which Aufidius Bassus left unfinished. Pliny's continuation of Bassus's History was one of the authorities followed by Suetonius and Plutarch. Tacitus also cites Pliny as a source. He is mentioned concerning the loyalty of Burrus, commander of the Praetorian Guard, whom Nero removed for disloyalty. Tacitus portrays parts of Pliny's view of the Pisonian conspiracy to kill Nero and make Piso emperor as "absurd" and mentions that he could not decide whether Pliny's account or that of Messalla was more accurate concerning some of the details of the Year of the Four Emperors. Evidently Pliny's extension of Bassus extended at least from the reign of Nero to that of Vespasian. Pliny seems to have known it was going to be controversial, as he deliberately reserved it for publication after his death:

It has been long completed and its accuracy confirmed; but I have determined to commit the charge of it to my heirs, lest I should have been suspected, during my lifetime, of having been unduly influenced by ambition. By this means I confer an obligation on those who occupy the same ground with myself; and also on posterity, who, I am aware, will contend with me, as I have done with my predecessors.