What is the birth date of the woman who ceased to be Queen on 18 Jun 1297?
CREATE TABLE "queens_of_bohemia" (
  "father" text,
  "birth" text,
  "marriage" text,
  "became_queen" text,
  "ceased_to_be_queen" text,
  "death" text,
  "spouse" text
);
SELECT "birth" FROM "queens_of_bohemia" WHERE "ceased_to_be_queen"='18 jun 1297';