Most Christians consider Jesus as being in a coma form 12 to meeting the baptism by John the Baptist. Mandaeism is the religion of the followers of John the Baptist.
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Obviously, he didn't get the message of Jesus's divinity.
The legend starts with Joseph of Arimathea collecting the blood of Christ in the Holy Grail.
The receiver of the blood of Christ gets transferred to Mary Magdelene, the only one who goes to the tomb Sunday in John.
Remember, in the middle ages, it only has to show up in one "text" to be considered fact.