My Family Tree

No original reference found for marriage in Augusta Co, VA, and I think it more likely they were married in Jackson Co, TN. The Thomas's arrived there in 1804 but the Davenport's probably did not arrive until after 1810. Marriage performed by Rev Richard Johnson of Sumner Co, TN.

http://www.scvcamp469-nbf.com/ancestors/Ellis-Ancestor.htm
Captain Robert Rodolphus Davenport was born in Jackson Co., Tenn. on August 8, 1823. Capt. Davenport was the son of Joseph Davenport, a veteran of The War of 1812 who was born in Virginia on June 2, 1789, and Mary Thomas Davenport. There were 7 children in this family, and in about 1839 all 7 brought their families as a group to Little Wills and Big Wills valleys (later known as Valley Head) where they settled on farms. Valley Head became an early trading center for the area. The first general store was operated by Robert Rodolphus Davenport. Robert R. Davenport married Margaret Annie Spring, who was born Dec. 21, 1826 in Pikeville, Tenn. She died Sept. 4, 1904. They had ten children.

Robert Rodolphus Davenport's father, Joseph Davenport, also known as Colonel Joe, and Mary Thomas
Davenport had seven children:

1) Montraville Davenport was a Major who headed his own Cavalry Brigade, fought under Gen. Nathan B.
Forrest and was with the General when he surrendered at Selma, Alabama in 1865. He, in turn, had 2 sons who also fought in the Civil War:
1) Thaddeus Davenport
2) Glen Davenport
. Montraville died in Arkansas where he went to get away from the Southern Yankees.
2) Orville Davenport married Mary Grant (a distant relative of President U.S. Grant, a fact no one in the family was proud of). Orville and Mary had 13 children, 4 of whom fought in the Civil War:
1) Joe Davenport fought in Virginia
2) Frank Davenport fought in Tennessee
3) Cicero Davenport, who fought in his Uncle Montraville's Cavalry Brigade
4) Taylor Davenport, who also fought in the same Montraville's Cavalry Brigade

After Mary's death, Orville then married a Miss Almon and they had 4 more children.
3) Belcher Davenport fought in Capt. R.R. Davenport's Brigade and was killed in action.
4) Adrian Davenport was born handicapped and did not serve.
5) Adeline Davenport married David Springs, who was an officer in Capt. R.R. Davenport's Brigade under Gen. Nathan B. Forrest.
6) Emeline Davenport married a Mr. Holliman. They sent 3 sons to war:
1) Tom Davenport [sic] - wouldn't these be Holliman's?
2) Bill Davenport
3) Rozz Davenport.

7) Eveline Davenport married a Mr. Clayton.[sic: incorrect - she married Samuel Moore]

and see http://worldconnect.rootsweb.com/cgi-bin/igm.cgi?op=GET&db=jcb1976&id=I3968

Note: His brother Henry married Hannah Cassetty, daughter of Thomas Cassetty and Sarah Thomas (Augusta Co, VA->Franklin Co, VA) (see http://awt.ancestry.com/cgi-bin/igm.cgi?op=AHN&db=lloydmatthews&id=I06081&ti=5535 )
If Mary Thomas and Sarah Thomas are kin, the brothers probably came from there.

home in 1820: Jackson Co, TN
home in 1830: Smith Co, TN (prob same area down War Trace Creek)
==> bought land in Smith Co, TN Jan 10, 1834; Smith Co, TN Tax List of 1837
home in 1840: De Kalb Co, AL

The origin of the strange names of Joseph and Mary's children is unknown, however I think it likely that they were based on fictional characters in the popular books of the period, eg,
1) Belcour and Montraville are brother protagonists in Susanna Rowson's "Charlotte Temple"
2) Emmeline and Adaline are in Charlotte Smith's "Emmeline"