What happens to the church when the emperor becomes a Christian? Seventeen hundred years after Constantine's victory at Milvian Bridge, scholars and students of history continue to debate the life and impact of the Roman emperor who converted to faith in the Christian God and gave peace to the church. This book joins that conversation and examines afresh the historical sources that inform our picture of Constantine, the theological developments that occurred in the wake of his rise to power, and aspects of Constantine's legacy that have shaped church history.