Titus Livius, often known as Livy in English, was a Roman historian who wrote a monumental history of Rome, Ab Urbe Condita, from its founding (traditionally dated to 753 BC) through the reign of Augustus in Livy's own time.

Livy's writing style was poetic and archaic in contrast to Julius Caesar's and Cicero's styles. Also, he often wrote from the Romans' opponent's point of view in order to accent the Romans' virtues in their conquest of Italy and the Mediterranean. In keeping with his poetic tendencies, he did little to distinguish between fact and fiction. Although he frequently plagiarized previous authors, he hoped that moral lessons from the past would serve to advance the Roman society of his day.