Who was William Lee as noted in the biography, Washington: A Life?

William Lee was a slave owned by Washington. Lee was a loyal valet to Washington who traveled with him during the Revolutionary War. During the few years that Washington lived at Mount Vernon after the war, Lee was injured and broke both knees in separate accidents. Despite his inability to continue to serve Washington, William Lee was taken to New York to be a member of Washington's household as he served as president. The relationship between Washington and Lee was remarkable for the time period.