History of the Roman Empire disputes about the supreme authority, this finally formalised a peaceful succession of the emperor: in each half a "Caesar" would rise up to replace the "Augustus" and select a new "Caesar". On May 1, 305, Diocletian and Maximian abdicated in favour of their "Caesars". Galerius named the two new "Caesars": his nephew Maximinus for himself, and Flavius Valerius Severus for Constantius. The arrangement worked well under Diocletian and Maximian and shortly thereafter. The internal tensions within the Roman government were less acute than they had been. In "The Decline and Fall of the Roman Empire", Edward Gibbon notes that this
The Historians' History of the World of the Western Roman Empire in 476. It discusses the rise of Christianity, the many emperors who held power in Rome during the founding and the fall of the Roman Empire, the division of the Roman Empire and the many barbarian invasions (Huns, Goths, Vandals) leading up to Rome's fall. "Part XI: The History of the Later Roman Empire" states that, along with over 75 additional authors, the work is based chiefly upon the following authorities: Agathias, Appian, Augustan History, J. B. Bury, Henry Fynes Clinton, George Kedrenos, Anna Komnene, Cassius Dio, Doukas (historian), Einhard, Eutropius (historian), George Finlay, Heinrich