I was on the Adams county forum and found this book http://www.rootsweb.ancestry.com/~inadams/Library.html
Reminiscences of Adams, Jay & Randolph Counties
by Martha C. Lynch, 1896 (353 pages)
On page 66 there is mention of a John, Margaret, and Mathias Miller.
I don't know it this will help but there is alot of interesting things in the book.