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Question:
What sources could Tacitus or Appian have used that have since been lost?
Tacitus (56 c. - 120 AD) is famous for writing
Appian (c. AD 95 – c. AD 165) wrote 24 books and most of them only sections survive today. His most important works were 13–17 of the Roman History, were on the Roman Civil Wars. But broadly he was a Roman historian who wrote on Rome.
Sources which both Tacitus and Appian might have used which are now lost to history?
Cato the Elder (234–149 BC)
Livy (59BC - 17AD)
Sources: