I am currently a college student, and this epitaph was brought up in one of my classes. My professor actually did a rubbing of this headstone himself, and while I believe that his headstone was in Concord, I am not 100% sure on this. However, I do know that in 1765 he bought his freedom, by working as a shoemaker. He did live in Concord, but was considered somewhat of an outcast. He became isolated in the latter part of his life, and essentially drank himself to death. He was never invited to be a citizen, although he was technically free. He died in 1773. Again, all of this information was presented to me in a class. The professor said he had done this research himself, due to a personal interest. I hope this is of some help.