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_name_55 ( birth VARCHAR, spouse VARCHAR, became_consort VARCHAR )

### Question ###
Name the birth of the person that has a spouse of frederick iv and became consort of 4 april 1721

### Accurate SQL ###

SELECT birth FROM table_name_55 WHERE spouse = "frederick iv" AND became_consort = "4 april 1721"