CREATE TABLE table_6452 ("Birth" TEXT, "Marriage" TEXT, "Became Duchess" TEXT, "Ceased to be Duchess" TEXT, "Death" TEXT, "Spouse" TEXT)

WHo Became Duchess that has a Death of 26 october 1614?
SELECT "Became Duchess" FROM table_6452 WHERE "Death" = '26 october 1614'
SELECT "Became Duchess" FROM "table_6452" WHERE "Death" = '26 october 1614'