The Roman Catholic church, headquartered in Rome, Italy, has its own powerful City-State, the Vatican. The Roman Catholic church unofficially came into being in 312 A.D., at the time of the so-called "miraculous conversion" to Christianity of the Roman Emperor Constantine but he still worshipped the sun god. Although Christianity was not made the official religion of the Roman Empire until the edicts of Theodosius I in 380 and 381 A.D., Constantine, from 312 A.D. until his death in 337, was engaged in the process of simultaneously building pagan temples and Christian churches, and was slowly turning over the reins of his pagan priesthood to the Bishop of Rome. However, the family of Constantine did not give up the last vestige of his priesthood until after the disintegration of the Roman Empire – that being the title the emperors bore as heads of the pagan priesthood – Pontifex Maximus – a title which the popes would inherit. The popes also inherited Constantine's titles as the self-appointed civil head of the church – Summus Pontifex (Vicar of Christ and Bishop of Bishops). [Full article]