The Annals (Latin: Annales) is a history book by Tacitus covering the reign of the four Roman Emperors succeeding to Caesar Augustus. The parts of the work that survived from antiquity cover most of the reigns of Tiberius and Nero.
The title Annals was probably not given by Tacitus, but derives from the fact that he treated this history in a year-by-year form. The original title was most likely Ab excessu divi Augusti, "Following the death of the divine Augustus".
Excerpted from Wikipedia, the free encyclopedia.