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_58 (primary_conference VARCHAR, founded VARCHAR, affiliation VARCHAR)
### Question:
What is the primary conference that was founded before 1866 and has an affiliation of private/catholic?
### Answer:
SELECT primary_conference FROM table_name_58 WHERE founded < 1866 AND affiliation = "private/catholic"