Two entries with the name Merlin’s Tower.

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Merlin’s Tower

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An enchanted tower between the White Castle and the town of Gasan.

It was prophesied that only Lancelot would end the enchantments.

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Source
Vulgate Lancelot | 1215-1230

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Merlin’s Tower

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A tower on the Turning Isle (Turnance) once inhabited by Merlin.

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Source
Le Livre d’Artus | Early 13th century

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