 Under the Frankish kings, it eventually, and partially, reunified, and the anarchy evolved into feudalism.Much of the basis of the post-Roman cultural world had been set before the fall of the Empire, mainly through the integration and reshaping of Roman ideas through Christian thought.The Greek and Roman paganism had been completely replaced by Christianity around the 4th and 5th centuries, since it became the official State religion following the baptism of emperor Constantine I.