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
— Excerpted from Wikipedia, the free encyclopedia.