Board Thread:Show-Related Questions and Answers/@comment-26151936-20151203000651/@comment-1916997-20151203001631

The Siren of Lake Nostos is not the same person as Lancelot's mother. Lancelot's mother is the Lady of the Lake, but the lake she is of is not Lake Nostos. The reason Lancelot's mother is the Lady of the Lake is because that is traditionally who she is.