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A spring in the Perilous Forest.

Before it was known by that name, it boiled constantly, and contained the head of King Lancelot, Lancelot’s grandfather.

Lancelot removed the head, but the fountain continued to boil until the Grail Quest, when Galahad plunged his hands into it and, because he had never known lust, caused it to cool.

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See also
Chapel of the Boiling Well | The Legend of King Arthur
Forest of the Boiling Well | The Legend of King Arthur

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Source
Vulgate Queste del Saint Graal | 1215-1230