CREATE TABLE table_name_19 (ceased_to_be_countess VARCHAR2, birth VARCHAR2)

When did the person born on 3 May 1446 cease to be countess?
SELECT ceased_to_be_countess FROM table_name_19 WHERE birth = "3 may 1446"
SELECT "ceased_to_be_countess" FROM "table_name_19" WHERE "3 may 1446" = "birth"