An historical narrative originally composed in Greek during the reigns of Septimius Severus, Geta and Caracalla, Macrinus, Elagabalus and Alexander Severus. According to Wikipedia: Lucius Cassius Dio Cocceianus (c. AD 155 or 163/164[3] to after 229), known in English as Cassius Dio, Dio Cassius, or Dio (Dione. lib) was a Roman consul and a noted historian writing in Greek. Dio published a history of Rome in 80 volumes, beginning with the legendary arrival of Aeneas in Italy through the subsequent founding of Rome (753 BC), the formation of the Republic (509 BC), and the creation of the Empire (31 BC), up to 229 AD; a period of about 1,400 years. Of the 80 books, written over 22 years, many survive into the modern age intact or as fragments, providing modern scholars with a detailed perspective on Roman history.