Where did roman religion begin and end

It started in the 4th century AD and i do not know when it ended. Sorry.

Roman religion, also called Roman mythology, beliefs and practices of the inhabitants of the Italian peninsula from ancient times until the ascendancy of Christianity in the 4th century ad. In 313 C. E., Roman emperor Constantine the Great ended all persecution and declared toleration for Christianity. Later that century, Christianity became the official state religion of the Empire. This drastic change in policy spread this relatively new religion to every corner of the Empire.

Christianity was the official religion of the Roman Empire in 380 by Emperor Theodosius I, allowing it to spread further and eventually wholly replace Mithraism in the Roman Empire. Roman emperor Constantine the Great ended all persecution and declared toleration for Christianity.