the last of the Julio-Claudian dynasty, had been emperor for two years. He did not leave office until AD 68, when Pliny was 45 years old. During that time, Pliny did not hold any high office or work in the service of the state. In the subsequent Flavian dynasty, his services were in such demand that he had to give up his law practice, which suggests that he had been trying not to attract the attention of Nero, who was a dangerous acquaintance. Under Nero, Pliny lived mainly in Rome. He mentions the map of Armenia and the neighbourhood of the Caspian Sea, which was sent to Rome by the staff of Corbulo in 58. He also witnessed the construction of Nero's Domus Aurea or "Golden House" after the Great Fire of Rome in 64. Besides pleading law cases, Pliny wrote, researched, and studied. His second published work was The Life of Pomponius Secundus, a two-volume biography of his old commander, Pomponius Secundus. Meanwhile, he was completing his monumental work, Bella Germaniae, the only authority expressly quoted in the first six books of the Annales of Tacitus, and probably one of the principal authorities for the same author's Germania. It disappeared in favor of the writings of Tacitus (which are far shorter), and, early in the fifth century, Symmachus had little hope of finding a copy. Like Caligula, Nero seemed to grow gradually more insane as his reign progressed. Pliny devoted much of his time to writing on the comparatively safe subjects of grammar and rhetoric. He published a three-book, six-volume educational manual on rhetoric, entitled Studiosus, "The Student". Pliny the Younger says of it: "The orator is trained from his very cradle and perfected." It was followed by eight books entitled Dubii sermonis (Of Doubtful Phraseology). These are both now lost works. His nephew relates: "He wrote this under Nero, in the last years of his reign, when every kind of literary pursuit which was in the least independent or elevated had been rendered dangerous by servitude." In 68, Nero no longer had any friends and supporters. He committed suicide, and the reign of terror was at an end, as was the interlude in Pliny's obligation to the state. Senior officer At the end of AD 69, after a year of civil war consequent on the death of Nero, Vespasian, a successful general, became emperor. Like Pliny, he had