Among Pliny's greatest works was the twenty-volume work, "Bella Germaniae" ("The History of the German Wars"), which is no longer extant. "Bella Germaniae", which began where Aufidius Bassus' "Libri Belli Germanici" ("The War with the Germans") left off, was used as a source by other prominent Roman historians, including Plutarch, Tacitus and Suetonius. Tacitus – who most scholars agree had never travelled in Germania – used "Bella Germaniae" as the primary source for his work, "De origine et situ Germanorum" ("On the Origin and Situation of the Germans").