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Greco-Roman religion is an umbrella term used to refer to many religious traditions practised within the Roman Empire and eventually syncretized and assimilated into something resembling a complex whole. It originated largely in the pre-existing mythology of ancient Greece, which was appropriated by the Romans into their own religious practices. In its latter years, when it competed with Christianity, it was referred to by followers of that religion as paganism.
The original Greek pantheon was large, dominated by the Olympian gods and goddesses (Zeus, Hera, Aphrodite, etc.) but also containing many regional gods that were added to the Pantheon as the Greeks encountered new people with different gods. The major pantheon of Greek gods themselves is likely based on a set of Indo-European myths that have been lost, but which would have influenced the Greeks, the ancient Hindus, and the Norse, each of which share similar structures in the organization of their gods: Indra and Zeus, for example, or Parvati and Gaia.
When the Romans appropriated the religion they changed many of the gods' names; Zeus became Jupiter, Poseidon became Neptune, Hades became Pluto, etc. Native Roman gods such as Terminus were also preserved from earlier traditions, producing the Greco-Roman blend.
 Imported changes
Besides thus losing the support of a sector of the intelligentsia, the outland conquests of Greece and Rome repeatedly saw the traditional cults undermined by imported mystery cults, such as that of Bacchus in the early second century BCE and that of Mithras two centuries later, which gained large followings among the common people. They, along with philosophical traditions such as Manichaeism, became popular enough that the emperor Diocletian, the first "absolute" ruler of the Roman Empire, undertook religious reforms intended to restore the Olympians to their former stature.
Christianity did not gain the upper hand until force was employed against the pagans. In CE 312, the Roman emperor Constantine converted to Christianity after a victory in battle against another contender for the imperial throne. Within a few years, he removed all legal restrictions on Christianity in the Edict of Milan. The Christians then began roving about smashing pagan shrines in spite of laws set up to protect them. Also, Constantine and his successors began almost immediately to proscribe pagan rites and work on converting the population to Christianity by force, culminating in the total ban on pagan rituals in 392. Increasingly isolated pockets of pagans survived for some centuries longer; notably Hypatia of Alexandria, murdered in 415 in the midst of a religious dispute, and the Maniots, inhabitants of a mountainous region in southern Greece, who were the last Greco-Roman pagans to be Christianized, in the 9th century.
 Historical blending of the religions
Throughout most of Western history, the retellings of the Greek and Roman myths were done in a way that treated the whole of the ancient Greco-Roman world as having had a single monolithic religion rather than dozens of diverse cults. This was largely because the myths were viewed through the lens of Christianity, which tended to lump all the different cults together under the label of "paganism," and did not care much about the distinctions between them. As G.K. Chesterton put it, "The term 'pagan' is continually used ... as meaning a man without any religion, whereas a pagan was generally a man with about half a dozen."
Modern scholars, using techniques that put the old myths back in context, have documented much more extensively the rich and complex religions that existed across the Hellenic world.
 See also
- Greco-Roman religion
- Ancient Greek and Roman Religion
- Parting the Parthenon Debunking the Greek gods
- Ancient Greek Mythology