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In Response To: King Arthur = Oedipus?! ()

It's not my time period, but I think it is safe to assume that when it comes to royalty of any kind, "if it could happen, it did happen". Perhaps not in the very instance you give, but I suspect even so-called Christian rulers were playing by different rules. I also seem to recall that there is an example in Roman times of an emperor practising incest with his own mother.