Defending Constantine: The Twilight of an Empire and the Dawn of Christendom is a 2010 book by Peter Leithart which examines Constantine the Great and Christianity.
Leithart argues that Constantine was a real Christian, and takes issue with John Howard Yoder's view on Constantinianism, arguing that there was no Constantinian shift.
[1][2] Defending Constantine provoked a book-length response: Constantine Revisited: Leithart, Yoder, and the Constantinian Debate, edited by John D. Roth (Wipf and Stock, 2013).
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