It would seem that Thomas Baker was born 8 January 1711, according David Baker Family bible, who names his parents as Thomas Baker, Born 8 Jan. 1711, and died 10 Jan 1777; wife Dorothy Davenport Baker Born 2 November 1716, died 1790. See Bible Source Below.
"In the late 1720s-early 1730s, a Thomas Baker, reportedly the son of a William
Baker and who had brothers named Josiah and William, married Davis Davenport’s
granddaughter Dorothy, daughter of Martin Davenport. Their eldest son was named
William and they also had a son named Josiah. The Bakers and Davenports, as well as
other related families, were intermarried and in concurrent settlement in Spotsylvania,
Louisa, and Culpeper counties in Virginia, and then in Western North Carolina from the
early years of the Eighteenth Century and forward.
"Baker Family Genealogy claims that the Thomas who married Dorothy Davenport
was born in Pennsylvania of a family that first arrived in America in 1635. That
identification, as has been outlined above and will be discussed at various points below,
is problematic at best. Moreover, the presence of a Thomas Baker line in the
neighborhood of Davis and Martin Davenport from at least 1696 forward suggests that
a Virginia origin for our Baker Family is far more likely. Marriages among commoners
in those days, a description fitting both the Davenports and Bakers, were
preponderantly among neighboring families, work days being long, travel being done by
horse or foot, and parents exercising their influence."
The following is from Pam G. Russell:
Marriage 1734 Thomas Baker married Dorothy Davenport, daughter of Martin Davenport Sr. and Dorothy [Glover?] Davenport, in 1734 at Hanover County, VA. 
1706 - Deed by Henry Nelson of King & Queen County and Elizabeth his wife to Thomas Baker of King William County, for 3000 lbs tobacco, 200 acres part of parcel granted to Henry Nelson by patent 23 October 1703. (King William County Records Book 1:330, Dated November 20, 1706) [The 1703 patent was for 2340 acres between North Wales Path and the branches of Perryes Swamp and Dorrells Swamp]
1718/9 - Land Patent: Thomas Baker, 132 acres of Escheated Land in New Kent County, on Baker’s branch, cornering on James Duke on Ware Creek, to mouth of Haynes Spring branch, being land escheated from John Haynes (Haines), Decd., by inquisition of Edmund Jennings, Esqr., for 100 acres. Upon survey returned by John Syme, Surveyor, found to contain 132 acres. For 2 pounds of
Tobacco for every acre. (Virginia Patents, 11:13)
Then General George Washington commisioned Thomas Baker, a Colonel in the Continental Army, to supply the Army with gunpowder, a position he served well until an accidental explosion of the powder magazine killed him.
The following is from Judy G. Russell:
Death:10 Jan 1777 Thomas Baker died on 10 Jan 1777 at prob Culpeper County, VA, at age 66. In David Baker's Revolutionary War service pension application, he stated that his father had died while he was in service (and thus between February 1776 and February 1778).
The family history, repeated at various websites, is that Thomas Baker operated a gunpowder mill and was making gunpowder for the Continental Army when the mill exploded and he was killed. There is no known documentation of this story. To the contrary, although both will and deed books survive in their entirety in Culpeper County, there is no documentation even to suggest that Thomas died there. 
David Baker Bible Record:
Bible of David Baker naming his parents, brothers, & sisters, with birth dates. These were also named by Charles Baker, with comments.
Thomas Baker born 8 Jan. 1711, died 10 Jan. 1777;
wife, Dorothy Davenport Baker, born 2 Nov. 1716, died 1790, age 74.
(1) William born 20 July 1735, "married a cousin on Mothers' side",
moved to Boteourt County, Virginia;
(2) Thomas Jr., born 6 April 1737, died single;
(3) Mary born 5 April 1739, married William Mallory. She died before Feb. 1779, leaving 4 minor daughters: Ann married John Patton; Dorothy married 1st to Robert Jarratt, & 2nd to Charles Kennedy; Elizabeth married Charles Lane; & Mary, who married George Blair.
(4) Martin, born 23 Jan. 1741, married Phoebe Snodgrass, moved to Boteourt County, Virginia, served in the Revolution. Then he went to Louisville, Kentucky and died 13 July 1821. He had 2 sons, Thomas & William, see D.A.R.;
(5) Crotia "Croshee", born 12 May 1743, married (Joseph?) Gouge, lived in Burke County, North Carolina, then Georgia, & died in Jackson County, Alabama;
(6) Josiah "Jo", born 23 Jan. 1745, married and raised a family at New River, Virginia;
(7) Henry, born 10 May 1747, married ca. 1772, Culpeper Co., Va., moved to Burke Co., N.C. He was a blacksmith, Estate Pr. 4th Monday, July 1806 (Court Minutes of Burke County, N.C.). His sons appeared to have been: Thomas; Henry Jr.; John; Charles & David ;
(8) David, born 3 June 1749;
(9) Dorothy, born 11 Feb. 1751, married after Jan. 1775 to James Baxter.
10) Richard, born 23 Dec. 1753, died 27 Dec. 1776 in Battle at Trenton, New Jersey, while serving under Gen'l George Washington (Reference: His bother, Davids' application for a pension);
(11) James born 18 Feb. 1755 is single in 1790 Census of Burke County, North Carolina. His brother said he married and moved to Tennessee, on Wolfe River in Overton or Morgon County.
(12) John, born 4 May 1758, married Urcilla White in Burke County, N.C. 24 June 1787. He died 7 Dec. 1806 in Jefferson County, Tennessee.
(13) Charles Baker, born 2 Feb. 1762 (End Of Bible Entry)
It may be possible to confirm family relationships with Thomas 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 Thomas:
Thomas Baker is most likely related to the Bakers of New Kent, possibly having his origins in Martin Baker who immigrated from Plymouth, Devonshire County, England in the year 1633 and is recorded in York County, Records. Also, this paper http://pamunkeybakers.com/paper/03.pdf
gives a good run down of why Thomas Baker is most likely related to this family. It seems wrong to leave Thomas Baker parents as William Baker & Mary from Massachusetts, when there is absolutely NO proof to that connection at all. Of course I am willing to be proven wrong. So, I suggest we disconnect this Thomas Baker from these Massachusetts's parents and just leave it blank. Also, where does this middle name "Corbie" come from or is this something just copied without proof. I would suggest that we also take off that middle name, until further proof is provided. In this time period most people did not have middle names yet.
I would like to correct a couple errors with Thomas' parentage, but want to give you a heads up. It looks like Thomas' mother needs removed and Mary Unknown put in her place. Thomas' mother's maiden name isn't known, and this Thomas is not connected to the Winslow family, so her marriage to a different William Baker is making incorrect relationship show up. Please post here if you have sources that indicate otherwise. Thank you!
Baker-14229 and Baker-2190 appear to represent the same person because: These two Thomas Baker's are both married to Dorothy Davenport, the daughter of Martin Davenport, Sr. this merge will finish the clean-up of the Martin Davenport Family. Thanks, Mags