Publius (or Gaius) Cornelius Tacitus (; ; – ) was a senator and a historian of the Roman Empire. The surviving portions of his two major works—the "Annals" and the "Histories"—examine the reigns of the Roman emperors Tiberius, Claudius, Nero, and those who reigned in the Year of the Four Emperors (69 AD). These two works span the history of the Roman Empire from the death of Augustus, in 14 AD, to the years of the First Jewish–Roman War, in 70 AD. There are substantial lacunae in the surviving texts, including a gap in the "Annals" that is four books long. 

Tacitus' other writings discuss oratory (in dialogue format, see "Dialogus de oratoribus"), Germania (in "De origine et situ Germanorum"), and the life of his father-in-law, Agricola, the Roman general responsible for much of the Roman conquest of Britain, mainly focusing on his campaign in Britannia ("De vita et moribus Iulii Agricolae"). 

Tacitus is considered to be one of the greatest Roman historians. He lived in what has been called the Silver Age of Latin literature, and is known for the brevity and compactness of his Latin prose, as well as for his penetrating insights into the psychology of power politics.
Who is one of the best Roman historians?
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What aspect of it?
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Was he a politician?
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Who is Claudius?
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Did he write long works?
Tacitus
Tacitus is considered to be one of the greatest Roman historians
power politics
his penetrating insights into the psychology of power politics
psychology
into the psychology of power politics
Latin
 and is known for the brevity and compactness of his Latin prose
yes
Publius (or Gaius) Cornelius Tacitus (; ; – ) was a senator 
he was a senator
Publius (or Gaius) Cornelius Tacitus (; ; – ) was a senator
two
 The surviving portions of his two major works
the "Annals" and the "Histories"
 The surviving portions of his two major works—the "Annals" and the "Histories"
69 AD
Year of the Four Emperors (69 AD)
a Roman emperor
Roman emperors Tiberius, Claudius, Nero
a Roman emperor
Roman emperors Tiberius, Claudius
14 AD
the death of Augustus, in 14 AD
First Jewish–Roman War
he years of the First Jewish–Roman War, in 70 AD
A Roman emperor
Roman emperors Tiberius, Claudius, Nero
Agricola
his father-in-law, Agricola
the Roman general
 Agricola, the Roman general
the Roman conquest of Britain
Agricola, the Roman general responsible for much of the Roman conquest of Britain
yes
Tacitus' other writings discuss oratory (in dialogue format, see "Dialogus de oratoribus"), Germania (in "De origine et situ Germanorum"), and the life of his father-in-law, Agricola
Silver Age of Latin literature
Tacitus is considered to be one of the greatest Roman historians. He lived in what has been called the Silver Age of Latin literature
no
 known for the brevity and compactness of his Latin prose