My Family Tree

son Thomas refers to him in his pension application:
"With regard to the certificate of Mr Heath at Richmond finding the name of Thomas Cassidy; this affiant will further state that he never knew any other man by that name he was acquainted with a great many of the Continental troops of Virginia but never saw or heard of any other person by that name except his Father who was too old to be in the War of the Revolution"

This is undoubtedly him -
"NOVEMBER, 1764.  Crawford vs. Cassety.--Deposition in Rowan County, North Carolina, of George Felton, relating to a contract in 1761 of James Huston and James Crawford, to rent a plantation in Augusta from Jonas Henderson. They engaged Thomas Cassety to crop it, which he failed to do. Dated, 15th October,  1764."
http://files.usgwarchives.net/va/augusta/court/court17.txt

"Chronicles of the Scotch-Irish Settlement in Virginia, 1745-1800"
"March, 1769 Wilson vs Christian. -William and John Wilson, debtors to Is[rael] Christian.  Sundries.  1756-1757, Feb 26; 1759, March 22; May 31, cash to Thos. Cassaty; credit by Thomas's Rainging, £2, 2, 0;..."

Possible relation:
"NOVEMBER 16, 1752.  (363) Neil Cassidy exempted from levy on account of great age and poverty."
http://files.usgwarchives.net/va/augusta/court/or3-55.txt

Virginia Land, Marriage, and Probate Records, 1639-1850 about Neal Cassaty
Name: Neal Cassaty, with James Hemphill
Date: 10 Nov 1752
Location: Augusta Co., VA
Property: 400 acres; Buffalo Creek of North Fork of James
Notes: This land record was originally published in "Chronicles of the Scotch-Irish Settlement in Virginia, 1745-1800. Extracted from the Original Court Records of Augusta County" by Lyman Chalkley.
Remarks: Patented to James Wood 12 Jan 1746.
Description: Witness
Book: 4-523

==> This land appears to be in the same location as one referencing Thomas Cassity because of the Christian and Henderson names in common:
" Page 466.--18th February, 1747. £30. John Davison, farmer to Wm. Henderson, farmer, 350 acres on north branch of James River at mouth of Buffalo Creek. Teste: Jno. Christian, Robt. Christian, W. Christian. Acknowledged by John, 18th February, 1747, and Jean, his wife, releases dower. "
http://www.werelate.org/wiki/Early_Settlers_on_the_James_River%2C_Augusta_County%2C_VA
[Buffalo Creek is in present-day Rockbridge Co, VA]

Virginia Land, Marriage, and Probate Records, 1639-1850 about Neil Casaty
Name: Neil Casaty
Date: 17 Nov 1767
Location: Augusta Co., VA
Notes: This probate record was originally published in "Chronicles of the Scotch-Irish Settlement in Virginia, 1745-1800. Extracted from the Original Court Records of Augusta County" by Lyman Chalkley.
Remarks: Samuel Davis' bond (with Richard Woods) as administrator of Neil Casaty. [Samuel Davis also provided bond to be guardian of James Casety , orphan of Neil Casety]
Description: Decedent
Book: WB4-51

Virginia Land, Marriage, and Probate Records, 1639-1850 about Neal Casedy
Name: Neal Casedy
Date: 15 May 1767
Location: Augusta Co., VA
Notes: This probate record was originally published in "Chronicles of the Scotch-Irish Settlement in Virginia, 1745-1800. Extracted from the Original Court Records of Augusta County" by Lyman Chalkley.
Remarks: James Davis' estate appraised, by Jno. McCollom et als. Neal Casedy's bond; Martha Goldbreath; Robt. Shannan's bond; bonds of, viz: Jno. Neeley, Jno. Wiley, Andw. Smithers, Moses Coiler (Collier?).
Description: Bondsman
Book: WB4-1

from "Chronicles of the Scotch-Irish Settlement in Virginia, 1745-1800" [pg141 ebook from google]
August 18, 1767 pg216 John Casaty to be summoned to show cause why he does not qualify on estate of father, Neil Casaty.
James Casaty to be bound to Michael Kirkham.  Patrick Casaty to be bound to Wm. McBride.
[pg140] John Cassaty, aged 16, orphan of Neil Cassaty, chose Saml. Davis his guardian.  Samuel Davis qualifies administrator of Neil Cassaty.
[pg156] Peter Cassaty, orphan of Neal Cassaty, to be bound to Saml. Wallace, to learn trade of carpenter.
[pg495] 1769 ...Andrew Caseday, in goal [jail], runaway, 10 days;...

A "Thomas Cashaday" of Augusta Co, VA fought in the French-Indian War of 1758
http://files.usgwarchives.net/va/augusta/military/frenchindian/fiw_augusta.txt
[This is too early to have been Thomas Cassady b.1757 s/o Simon Cassady and Eleanor Layton ]

Potential connection. I find DNA matches who also match my Cassetty cousins who claim descent from "Nicholas Cassetty" b.1789 in Peter twnp, Washington, PA and lived in Wilson Co, TN. The AGBI has a Thomas Cassetty b.1750 PA, and a "Hugh Casety" of Philadelphia, PA served in the Rev. War.