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 History of the Decline and Fall of the Roman Empire Christianity and then of the Roman State Church, and the history of Europe, and discusses the decline of the Roman Empire among other things. Gibbon’s work remains a great literary achievement and a very readable introduction to the period, but considerable progress has since been made in history and archaeology, and his interpretations no longer represent current academic knowledge or thought. Gibbon offers an explanation for the fall of the Roman Empire, a task made difficult by a lack of comprehensive written sources, though he was not the only historian to attempt it. According to Gibbon, the Roman Empire succumbed