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: