CREATE TABLE table_name_31 (spouse VARCHAR, became_duchess VARCHAR)

Who is The Spouse of the Duchess that has a Became Duchess on 31 october 1733 husband's accession?
SELECT spouse FROM table_name_31 WHERE became_duchess = "31 october 1733 husband's accession"
SELECT "spouse" FROM "table_name_31" WHERE "31 october 1733 husband's accession" = "became_duchess"