Comum itself. The community was thus multi-ethnic and the Plinies could have come from anywhere. Whether any conclusions can be drawn from Pliny's preference for Greek words, or Julius Pokorny's derivation of the name from north Italic as "bald" is a matter of speculative opinion. No record of any ethnic distinctions in Pliny's time is apparent—the population considered themselves to be Roman citizens. Pliny the Elder did not marry and had no children. In his will, he adopted his nephew, which entitled the latter to inherit the entire estate. The adoption is called a "testamental adoption" by writers on the topic, who assert that it applied to the name change only, but Roman jurisprudence recognizes no such category. Pliny the Younger thus became the adopted son of Pliny the Elder after the latter's death. For at least some of the time, however, Pliny the Elder resided in the same house in Misenum with his sister and nephew (whose husband and father, respectively, had died young); they were living there when Pliny the Elder decided to investigate the eruption of Mount Vesuvius, and was sidetracked by the need for rescue operations and a messenger from his friend asking for assistance. Student and lawyer Pliny's father took him to Rome to be educated in lawmaking. Pliny relates that he saw Marcus Servilius Nonianus. Junior officer In AD 46, at about age 23, Pliny entered the army as a junior officer, as was the custom for young men of equestrian rank. Ronald Syme, Plinian scholar, reconstructs three periods at three ranks. Pliny's interest in Roman literature attracted the attention and friendship of other men of letters in the higher ranks, with whom he formed lasting friendships. Later, these friendships assisted his entry into the upper echelons of the state; however, he was trusted for his knowledge and ability, as well. According to Syme, he began as a praefectus cohortis, a "commander of a cohort" (an infantry cohort, as junior officers began in the infantry), under Gnaeus Domitius Corbulo, himself a writer (whose works did not survive) in Germania Inferior. In AD 47, he took part in the Roman conquest of the Chauci and the construction of the canal between the rivers Maas and Rhine. His description of the Roman ships anchored in the stream overnight having to ward off floating trees has the stamp of an eyewitness account. At some uncertain date, Pliny