George Washington's best friend was General Henry Knox, whom he met during his service in the Revolutionary War. Knox became Washington's Secretary of War in 1789. Washington said of Knox, "There is no man in the United States....[with] whom I have had a greater friendship."
George Washington had many other close friends as well. At age 16, he met George William Fairfax, and Lord Fairfax became a mentor to him. Both Lord Fairfax and Sally Fairfax visited Mount Vernon frequently in later years. Henry Lee was another close friend that George Washington met early in life, and Lee ended up serving under George Washington during the American Revolution.