I don't know if it's the same graves, but the book The Cradle of the Republic[1] from 1906 mentions an excavation that found > several graves and tombstones, a

I don't know if it's the same graves, but the book The Cradle of the Republic[1] from 1906 mentions an excavation that found > several graves and tombstones, as well as mortuary tablets, > were discovered in the old foundations. In the chancel, lying > with its head to the north, was an iron tablet, probably > formerly a cenotaph, once embossed with inlaid brasses, > now missing. [1] https://books.google.com/books?id=4R4SAAAAYAAJ&pg=PA126#v=onepage&q&f=false https://books.google.com/books?id=4R4SAAAAYAAJ&pg=PA126#v=on...