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 for modern understanding of the history of the Roman Empire during the 1st century AD; it is Tacitus' final work, and modern historians generally consider it his greatest writing. Historian Ronald Mellor calls it "Tacitus's crowning achievement", which represents the "pinnacle of Roman historical writing".