Greek and Roman religion depended on images, quite literally: there were no sacred laws or scripture and certainly no organised church or priesthood … - Greg Woolf

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Greek and Roman religion depended on images, quite literally: there were no sacred laws or scripture and certainly no organised church or priesthood to police practice and correct error. It was in their images and their names that the gods persisted for at least two thousand years from the Bronze Age to the purges organised by monotheist emperors.