For 10 points, name this first emperor of the Roman Empire, the adopted son of Julius Caesar.
This emperor is said to have cried, "Varus, give me back my legions," after a loss to Arminius at the Battle of Teutoburg Forest. This ruler was the subject of a philippic by Cicero. This man's general Agrippa was successful in the Battle of Actium over his political opponent, who formed the Second Triumvirate with himself and Marcus Lepidus. This emperor was succeeded by Tiberius. For 10 points, name this first emperor of the Roman Empire, the adopted son of Julius Caesar.
This emperor is said to have cried, "Varus, give me back my legions," after a loss to Arminius at the Battle of Teutoburg Forest.
Gaius Julius Caesar {Augustus} [or Octavian; or Gaius Octavius Thurinus]