When was the person who became queen on 15 April 1820 born?
CREATE TABLE table_name_79 (birth VARCHAR, became_queen VARCHAR)
SELECT birth FROM table_name_79 WHERE became_queen = "15 april 1820"
### Context: CREATE TABLE table_name_79 (birth VARCHAR, became_queen VARCHAR) ### Question: When was the person who became queen on 15 April 1820 born? ### Answer: SELECT birth FROM table_name_79 WHERE became_queen = "15 april 1820"