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_56 (founded INTEGER, named_after VARCHAR)
### Question:
When is the earliest year founded for houses named after the river benue?
### Answer:
SELECT MIN(founded) FROM table_name_56 WHERE named_after = "river benue"