The book "Dion's Rome, Volume 3. An Historical Narrative Work, Originally Written in Greek During the Reigns of Septimius Severus, Geta and Caracalla, Macrinus, Elagabalus, and Alexander Severus: and Now Presented in English Form" recounts the events and reigns of the Roman emperors who ruled the Roman Empire in the 3rd century AD. The author of this historical work is Cassius Dio Coccianus, a famous Roman historian and politician. In his book, he talks about the important events and wars of that time, about the internal politics and foreign relations of the empire. This is a valuable document for anyone interested in the history of the Roman Empire and the events of the 3rd century.