CREATE TABLE table_6451 ("Birth" CLOB, "Marriage" CLOB, "Became Duchess" CLOB, "Ceased to be Duchess" CLOB, "Death" CLOB, "Spouse" CLOB)

Who is The Spouse of the Duchess that has a Became Duchess on 31 october 1733 husband's accession?
SELECT "Spouse" FROM table_6451 WHERE "Became Duchess" = '31 october 1733 husband''s accession'
SELECT "Spouse" FROM "table_6451" WHERE "Became Duchess" = '31 october 1733 husband''s accession'