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1. "Constantine the Emperor" by David Potter
2. "The Life of Constantine" by Eusebius of Caesarea
3. "Constantine: Dynasty, Religion and Power in the Later Roman Empire" by Timothy D. Barnes
4. "Constantine the Great: And the Christian Revolution" by G.A. Williamson
5. "The Roman Empire and the New Testament: An Essential Guide" by Warren Carter (Includes insights on Constantine's era)
   
These books provide comprehensive insights into Constantine the Great and his impact on the Roman Empire.