Roche de Sanc, la Roche du Sang

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A cliff near the city of La Choine, where King Evalach of Sarras (Evelake) fought a battle against King Tholomer of Babylonia. Evalach was nearly defeated, but a holy White Knight appeared and routed Tholomer’s forces. The enormous bloodshed at the battle stained the cliff red, giving it its name.

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Source
Vulgate Estoire del Saint Graal | 1220-1235