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_15 (date VARCHAR, result VARCHAR, bulgarian_commander VARCHAR)
### Question:
What is the date of Gavril Radomir's Bulgarian Victory?
### Answer:
SELECT date FROM table_name_15 WHERE result = "bulgarian victory" AND bulgarian_commander = "gavril radomir"