Not since the rule of Emperor Constantine, during the Roman Warm Era, have pagan gods been tolerated in Rome.
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Before Constantine, Romans worshipped 12 main gods including Apollo (the Sun), Diana (the Moon), Flora (the plants), Uranus (the sky), Ceres (the crops), Gaia (the Earth) and of course Bacchus (wine), Venus (love) and Mars (war). Some of these gods demanded tribute and sacrifice.
Christianity, the worship of one forgiving God, slowly absorbed or eliminated its pagan rivals. The Popes in Rome came to lead a Catholic empire of Christians. In modern times, the old Greek/Roman goddess, Gaia, has been resurrected by the world green movement.