Hi Bob, I have a Martha Darby that was born abt 1876 in Montgomery Co., Maryland, and died before 1820 probably in SC, since most of her family died in SC. Her parents were Josias (Josiah) Darby b.1734 in Montgomery Co., MD and died in 1821 in Union Co., SC and Druscilla Lipham b.1740 in MD and d.after 1790 in SC. She married Robert Wilson and had 2 children that I know of James b.abt 1810 and Lydia b.abt 1812. That's all I have on her. Hope this helps. Nancy O'Neal