Nightbringer | The Arthurian Online Encyclopedia

Mabon Rock

la Roche Mabon

A castle ruled by King Agrippes and besieged by King Vadalon.

Agrippes’ daughter ended the siege by poisoning the attacking army’s water supply. When Vadalon discovered this, he had the maiden imprisoned in iron bands, from which she was eventually freed by Sir Bors de Ganis.


Source
Vulgate Lancelot | 1215-1230