William "Billy" Lee was filled with concern as he walked up the lane with his brother to their new home at the Mount Vernon plantation in the fall of 1767. He was a 16-year-old enslaved person. His thoughts swirled through his mind: How would he be treated? What would the family be like? What would he do here? Where would he sleep? Would he make any friends? Would he ever be given his freedom? He could not have imagined that he would become a witness to the birth of a nation, a personal aide to George Washington, and an American hero.