The chief leader or supreme guide of mysterious rites, religious ceremonies, or secret initiations.
From 'arch-' (chief) + 'mystagogue.' 'Mystagogue' comes from Greek 'mystagogos' from 'mysta' (initiate) + 'agogos' (leader), referring to ancient priests who guided people through sacred mysteries.
In ancient Greek religion, mystagogues led people through secretive religious rites at Eleusis where they'd experience divine mysteries. An archmystagogue would be the supreme priest—the ultimate keeper of sacred secrets. That's a surprisingly deep position of power!
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