Several gods were adopted by the Romans along the time. The most important of them were deities from Egypt and Persia as Isis, Cibeles or Mithras. Their cult was related with the afterlife and immortality. These cults were introduced by legionaries in the Roman world.
In the first century AD, the followers of Jesus Christ founded a new religion called Christianity . The Christian were persecuted by the Romans because they refused to worship the emperor. However , the emperor Constantine allowed Christianity in 313 AD and Theodosius declared that Christianity was the official religion in the empire.