Wes, if you're still there I would like to respond. I haven't been into these Millers for several years and it will take me a while to find my place, but I am interested in this family. Ancestry didn't let me know I had a reply to my query back in 2013 or I would have been on this sooner.
Yes, this is Timothy Miller who married Julia Glenn. I have both of those marriages you show. I also show that there were at least three children (from early census records) that I have not located.
Children I show are:
three unknown
1. female b. 1820-1825
2. male b. 1820-1825
3. male b. 1825-1830
4. Joseph b. 1827
m. Eveline Orndorff
m. Caroline Rebecca Orndorff
5. Thomas b. 1832
m. Margaret Barton
6. Sarah Isabelle b. 18 March 1838
m. Andrew Jackson Marston
7. Martha Miller
8. John Ambrose b. 23 June 1845
m. Sarah Ellen Welsh
I have a copy of Julia Glenn Miller's pension application. I have three independent sources for the KY birth. My ancestor, Sarah I. Miller Marston stated in the 1880 census that her father was born in Kentucky. Another Miller descendant says that he has a death certificate for John Ambrose Miller and it states that his father was born in KY. A descendant of Emily Miller Angwin has a death certificate for Emily (have not seen) and she states that her father was born in KY. I agree that it is strange and Kentucky was not a state until 1792. Timothy was born in 1784 if Julia's pension information is correct. It may not be as I always thought he was born around 1790 (early census records). However, I have some Millers who were in KY early who came from Shenandoah County and might relate to Timothy. Kentucky Court and Other Records - George Miller deed dated 18 Feb 1822 - George Miller and wife, Mary Ann, William Miller and wife Polly - Clark County KY, conveyed to Joseph Miller of same county their rights in a tract of land in Shenandoah County VA on waters of Cabin Run, part of larger tract granted to George Bruce 25 May 1750, Bruce sold to George Miller, William Miller and Joseph Miller Nov 19, 1773.
It appears these Millers went to Clark County KY. Joseph stayed behind but later joined them by the 1830s. According to another researcher, "In December 1779, a part of settlers from what was referred to as Frederick County or the Shenandoah area of VA, set out for the wilderness of Kentucky. The group consisted of about 30 families of 18 different surnames. Could Timothy's father been one of this group? If so, then one or more of the Millers came back to Shenandoah County. Timothy was living there in 1820 when he was taxed and working for the furnaces owned by Blackford and Arthur.
As for Bartons or Millers, since I am at an impasse on the Millers, the Bartons might bring some more clues. One of the trees I have starts with William Barton b. 1766 and the other starts with Peter Miller, Jr. b. 1788 who married Christina Hisy. Their first daughter Elizabeth b. 1809 married Nathaniel Barton. Not a single source for any of this. Let me know and I can scan and email them to you.
I promise not to wait two years to respond. So sorry about that.