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Hmm, now I'm curious, what parallels do you see between Arthur and Theseus? You've mentioned this before but I don't think you've ever gone into details.
Both of them are bastards in the literal sense, but I think you've said you see Gawain as fitting the archetype itself better than Arthur. Is it because both are credited with trying to make political changes to their kingdoms? Both had angry/estranged sons. But those don't seem to be very strong thematic similarities. Men who became heroes without any supernatural powers (a la Heracles) only to find their past mistakes caught up with them and helped bring about their downfall?
Compare Arthur's acquisition of Excalibur to Theseus' acquisition of the Sword of Cekrops.
Compare their fathers and fatherings.
Compare the ideals by which they attempted to run their kingdoms.
And as you noted...
Compare their sons.
Compare their abillities.
Compare their downfalls.
I don't at all get why you don't see strong thematic similarities.