When did the person born on 3 May 1446 cease to be countess?
CREATE TABLE "1405_1482" (
  "name" text,
  "father" text,
  "birth" text,
  "marriage" text,
  "became_countess" text,
  "ceased_to_be_countess" text,
  "death" text,
  "spouse" text
);
SELECT "ceased_to_be_countess" FROM "1405_1482" WHERE "birth"='3 may 1446';