The Annals by Roman historian and senator Tacitus is a history of the Roman Empire from the reign of Tiberius to that of Nero, the years AD 14–68. The Annals are an important source to modern understanding of the history of the Roman Empire during the first century. The Annals is Tacitus' final work, and modern historians generally consider it his greatest writing. Historian Ronald Mellor considers it "Tacitus's crowning achievement" which represents the "pinnacle of Roman historical writing".