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_2439728_1 (founded INTEGER, school VARCHAR)
### Question:
when was lawrence academy at groton established? 
### Answer:
SELECT MIN(founded) FROM table_2439728_1 WHERE school = "Lawrence Academy at Groton"