CREATE TABLE table_69584 ("Birth" CLOB, "Marriage" CLOB, "Became Consort" CLOB, "Ceased to be Consort" CLOB, "Death" CLOB, "Spouse" CLOB)

Name the birth of the person that has a spouse of frederick iv and became consort of 4 april 1721
SELECT "Birth" FROM table_69584 WHERE "Spouse" = 'frederick iv' AND "Became Consort" = '4 april 1721'
SELECT "Birth" FROM "table_69584" WHERE "Became Consort" = '4 april 1721' AND "Spouse" = 'frederick iv'