I'm sort of noodling around Google Books, looking at 19th century publications trying to learn what I can about the earliest origins of Old Fitzgerald.
I think I found something.
The Report of the Commissioner of Internal Revenue for the year ended June 30, 1891, which is linked above, lists the Jno. E. Fitzgerald Distilling Company as a DBA of J. Swigert Taylor, RD 53 in Millville, Woodford County, Kentucky.
This same J. Swigert Taylor (son, if I recall correctly, of Col. E. H.) also had E. H. Taylor, Jr. and E. H. Taylor, Jr. and sons listed as DBAs.
RD 53 became DSP 19 after Prohibition. Simply put, at least in 1891 Old Fitzgerald was owned by, and produced at, Old Taylor. This information continues until the report of 1896, where it stops.
Then in 1901, John E. Fitzgerald 15 year old Bourbon and Rye were being advertised as being available on the best railroad dining cars, by the S. C. Herbst Importing Company. http://books.google.com/books?id=3n7...ourbon&f=false
So now I'm trying to figure out when Herbst got Fitz from Taylor, and indeed whether J. S. (or E. H.) Taylor created the brand or bought it from someone else.