The Annals of Tacitus, which chronicle the years AD 14-68, are arguably the greatest work of the greatest Roman historian. Book 3 of The Annals covers the years AD 20-22, a period including the trial of Calpurnius Piso for treason and the alleged murder of Germanicus. The editors are the first to compare a recently discovered record of this trial with Tacitus’ narrative of the same events. Throughout the volume attention is paid to literary matters, and textual. linguistic and historical issues are treated fully.