Two entries with the name Argistes.

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Argistes

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When Merlin was a boy (according to Italian romance), he prophesied that this man would be hanged, drowned and burned.

Argistes set fire to Merlin’s house. The fire spread to his own, so he rushed to the well, but the chain entwined itself about his neck. As he was in the well, people threw in burning rafters. Thus he died in the way Merlin had foretold.

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Argistes

Agristes

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Gawaine’s great-grandfather, descended from Joseph of Arimathea.

A king, Argistes was the son of Meliant. He married a Saxon noblewoman and had a son named Hedor.

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Source
Vulgate Estoire del Saint Graal | 1220-1235

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