Christopher, if the William Allen, born 1783 you are referring to is the son of Samuel Allen and Sarah Prater, and the wife of Caty Gearheart, then their daughter Nancy and your Nancy are not the same. Their Nancy was born abt. 1828 and had three different spouses, Shadrach Oliver, George Bradley, and John Howard. Of course, it could be a William Allen with the same birth year. I don't have your Nancy in my database, I'm sorry to say. Wish I could help more.