... a retarded person has been worshiped as a leader of a movement, etc? Maybe King Tut, the result of extreme incest,
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There is no indication that Tut was retarded, as far as I know. He likely died of wounds suffered in battle.
Tut definitely had all sorts of physical deformities associated with incest so I am making the leap that he had mental/emotional defects too though I admit it’s a leap.