Final answer:
The unity of the Roman Empire was maintained for several decades after Constantine's death, with only a brief resurgence of paganism under Julian. Constantine's legacy of Christian governance continued throughout the empire's history.
Step-by-step explanation:
After Constantine's death in 337, the unity of the Roman Empire was maintained for several decades. His sons who succeeded him waged military campaigns to protect the empire's borders, promoted Christianity, and enacted laws against pagan practices. The only significant attempt to revert back to paganism was made by Julian from 361 to 363, but his reign was short-lived. Overall, Constantine's legacy of Christian governance continued long after his death.