Armed thugs with an inflated sense of self-importance and way too much money to throw around, charged by the powers that be to go beat up dark-skinned people? Sounds like an ancient law enforcement agency to me.
We also have on record pretty much every thing Leonardo Davinci ever did, including the times he went to the bathroom.
Dan Brown is an example of how you can make millions writing a "historical novel" without ever cracking a single source.
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