Two entries with the name Red Tower.

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Red Tower

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A pagan stronghold.

The Lord of the Red Tower captured Gawain and tried to make him fight a lion, unarmed, but Gawain was rescued by Meliot de Logres.

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Source
Perlesvaus | Early 13th century

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Red Tower

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The stronghold of Partinal, uncle of Perceval.

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Source
Third Continuation of Chrétien’s Perceval | Manessier, c. 1230

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