Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_6115 ( "Name" text, "Birth" text, "Marriage" text, "Became Queen" text, "Ceased to be Queen" text, "Death" text, "Spouse" text )

### Question ###
How is the marriage of who became queen on 30 October 1816 husband's accession?

### Accurate SQL ###

SELECT "Marriage" FROM table_6115 WHERE "Became Queen" = '30 october 1816 husband''s accession'