When he met her in Sir Damas’ castle, masquerading as Damas’ daughter, Arthur thought he recognized her as a damsel he had seen around his own court.
Perhaps she could be identified with the damsel who brought Arthur Morgan’s gift of rich mantle, set with precious stones, ostensibly as a peace offering. Nimue, who was perhaps also acquainted with Greek tragedy, warned Arthur not to wear it or let any of his knights wear it unless Morgan’s messenger wore it first. Arthur made the reluctant damsel messenger try it on, and it immediately burned her to coals.
See also
Morgan Le Fay | The Legend of King Arthur