Blancemore, Blancemorne, Brangemore

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A sorceress who built the Chapel of the Black Hand. Her son Espignogrés (Espinogres) murdered her and buried her beneath the chapel’s altar.

The chapel became inhabited by a demon that slew many knights until it was vanquished by Perceval.

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