On 22 May 1740, his father, Alexander Breckenridge made oath that he had imported himself and John, George, Robert, Smith and Letitia Breckenridge from Ireland to Philadelphia, and from thence to VA, at his own charges.
Robert, while living in Augusta County, became prominent in the Indian Wars and was also Sheriff in 1755,
About 1752 or earlier, he married Mary Poage, and had two sons, Alexander and Robert.  She died about 1857.
After her early death, he married his 1st cousin Leticia Preston, daugher of John Preston of Staunton, and had fours sons and a daughter, William, John, James, Preston and Jane. Note, Robert's mother, Jane (Preston) Breckenridge, and Letitia's father, John Preston, were siblings
He acquired large acreage on Buffalo (Tinker) Creek and was one of the area's largest hemp producers. He was a very wealthy man and built his home near Daleville, Virginia just to the rear of the present-day Boaz home. It will be remembered that Botetourt County's first Court was held in his home in 1770. He was one of Botetourt County's leading citizens at the time of his death in 1772."
Col Robert Breckenridge died 15 September 1772 in Fincastle, Botetourt, Virginia. 
He was a captain of rangers under Major Andrew Lewis in 1756, member of the Augusta Council of War and prominent in the Indian Wars; member of the 1st board of trustees of the town of Staunton in1761; a vestryman there but was replace in 1769 by Captain Peter Hogg because he refused to subscribe to the doctrine and discipline of the Church of England. About which time or earlier he moved from the farm near Staunton into the new county of Botetourt and in 1770 was a justice of the first County Court of Botetourt County  and Lieut-Colonel of militia. 
Parents of Jane Breckinridge, William Breckinridge, John Breckinridge, James Breckinridge, Elizabeth Breckenridge and Preston Breckinridge
Excerpt from Ohio Illustrated Magazine
"The Poages. Three miles north of the site of Staunton, Va., then called Beverly's Mill Place, lived Robert Poage, his wife and nine children, emigrants, May 22nd, 1740. They located on the pike on 772 acres; his will was proved March 6th, 1774. One daughter married Robert Breckinridge, son of Alexander Breckinridge, and was his first wife; they had two sons - Robert and Alexander, both prominent in Kentucky. His second wife was Letice, daughter of John Preston, emigrant. The two, Robert Breckinridge, and John Preston, were the ancestors of the renowned families of those names in the South and West." 
↑ 1.01.11.21.3 Woodworth, Robert Bell. "The descendants of Robert and John Poage, Volume I, Published: Staunton, Virginia, Priv. print. by the McClure Print. Co., 1954. Page 695.
↑ 3.03.13.2 Ohio Illustrated Magazine, Volume 4, By Webster Perit Huntington; Link
↑ Photo of single page from unknown book, Section "Breckenridge", pg #118
↑ Colonial Families of the United States, 1607-1775", page 96.
↑ History of Southwest Virginia, 1746-1786: Washington County, 1777-1870; Published 1903; By Lewis Preston Summers; Transcribed by Andrea Stawski Pack Link
Virginia Land, Marriage, and Probate Records, 1639-1850 Publication: Name: Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2004.Original data - Chalkley, Lyman. Chronicles of the Scotch-Irish Settlement in Virginia, 1745-1800. Extracted from the Original Court Records of Augusta County. Baltimore: Genealogical P
Author: Yates Publishing Title: U.S. and International Marriage Records, 1560-1900 Publication: Name: Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2004.Original data - This unique collection of records was extracted from a variety of sources including family group sheets and electronic databases. Originally, the information was derived
Author: Ancestry.com Title: U.S., Sons of the American Revolution Membership Applications, 1889-1970 Publication: Name: Online publication - Provo, UT, USA: Ancestry.com Operations, Inc., 2011.Original data - Sons of the American Revolution Membership Applications, 1889-1970. Louisville, Kentucky: National Society of the Sons of the American Revolution. Microfilm, 508 rolls
It may be possible to confirm family relationships with Robert by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Robert:
IMHO, the Seldens of Virginia source provides enough corroboration to warrant the merge. A secondary source at best, but with attribution. Using the publishing date of 1911 it's probably possible to identify the James Breckenridge of St Louis who is the source of the information.
Breckenridge-413 and Breckenridge-37 appear to represent the same person because: These are definitely the same people and it's time to merge them. Please....it is confusing to have two duplicate profiles.
Breckenridge-37 and Breckinridge-79 are not ready to be merged because: These could represent the same person, but there's a lot of information that doesn't appear to match up well. I am unsure about approving the merge.