Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_84 (marriage VARCHAR, became_queen VARCHAR)
### Question:
How is the marriage of who became queen on 30 October 1816 husband's accession?
### Answer:
SELECT marriage FROM table_name_84 WHERE became_queen = "30 october 1816 husband's accession"