He observed, "They have made a desert and call it peace" in his major work, which opens by describing the (*) Year of the Four Emperors.
This man's co-prosecution of the proconsul of Africa, Marius Priscus, for extortion, inspired him to write about his teachers Secundus and Aper in his Dialogue on the Orators.  One of this man's works describes a victory over an army of Druids at the Battle of Ynys Mon and the establishment of a network of outposts stretching from Bodotria to Clota. He observed, "They have made a desert and call it peace" in his major work, which opens by describing the (*) Year of the Four Emperors. This man wrote one of the first ethnographies, the Germania,  and penned a biography of his father-in-law, the Agricola.  For 10 points, name this Roman historian who chronicled the Flavian dynasty in his Annals.
This man's co-prosecution of the proconsul of Africa, Marius Priscus, for extortion, inspired him to write about his teachers Secundus and Aper in his Dialogue on the Orators.  
Publius Cornelius Tacitus [or Gaius Cornelius Tacitus; accept Pliny the Younger before  "Dialogue on the Orators" is read]