John Ogilby Elgin was my great grandfather. I see you have gotten most of the information I have from others, but I'd be happy to share what I know.I'm from the Suzelle branch of the his children. He was known to my father as "Granddaddy Elgin."My version of the "traitor" story includes: (1) he was arrested in Washington D.C. for cheering as Lincoln's hearse went by and (2) he never signed the "Oath of Allegiance" required of all former Confederate soldiers.I have NO idea if either is historical fact.I'll be happy to share whatever else I know and I'd be interested in learning more from you. Incidentally, I have a few photographs of "Granddaddy Elgin"--one on my mantle has him, his wife Martha, my grandmother Suzelle, and I think Em and Minn (who I believe died shortly after in about 1898). John was very distinguished looking--he has the air of a southern Colonel (though I believe he was an enlisted man).According to our family lore, he swam his team of horses across the river near Harper's Ferry to join the confederacy. Enough here--more if you're interested.