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One of the ancient gods worshipped by the people of Sarras, before Joseph of Arimathea converted them to Christianity.

A devil inhabited a statue of Mars in King Evalach’s (Evelake) palace, but it was exorcised by Joseph’s son, Josephus.

In early mythology, Mars was the Roman god of War.

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Source
Vulgate Estoire del Saint Graal | 1220-1235