Agent 355 was a female spy during the American Revolutionary War, associated with the Culper Ring, a group of spies organized by George Washington. Her true identity remains unknown, but she played a crucial role in gathering intelligence for the Continental Army. She is believed to have operated in and around New York City, providing valuable information about British troop movements and plans. Agent 355's contributions were significant, and her story highlights the important role women played in espionage during the war, despite the lack of recognition they often received.