I came across info on Francis Rogan, M.D. in a post you made back in 2007. My great grandmother was a Margaret Rogan born in 1838. I think she might be the daughter of Francis Rogan (1787-1854) and Margaret Erskine Rogan (don't have birth date - but death date is 1864 I believe) of Londonderry. That's as far as I have been able to get. I would appreciate any info you would be willing to share with me. Thanks!
Patricia Grace