Yes, I’ve hesitated to make an explicit connection, partly because of the ironies in the Christianization of Rome / imperialization of Christianity, and partly because exegetically we do not have to suppose that the New Testament foresaw Constantine as such. Now I would be inclined to understand the whole lengthy and complex Christendom period as a flawed but inevitable experiment in the reshaping of the new creation according the imperial template. Arguably, in this respect Christendom was more true to the biblical narrative than the dissenting and reformist movements that opposed it. Another irony! The problem was, of course, that Christendom operated on the basis of power rather than grace.