Augustine Gatewood was mentioned in the will of his uncle Philip Gatewood dated 25 December 1756. [Essex County, Virginia, Will Book 10, pages 127–128.]

Augustine Gatewood was mentioned in the 1765 will of his father Isaac Gatewood. [Essex County, Virginia, Will Book 12, pages 225–226.]

Augustine was mentioned in the 27 June 1798 will of his mother, Mary Gatewood, proved 21 January 1799. “…my will and desire is that all the rest of my estate shall be sold and equally divided amongst my Children to wit Andrew, Gatewood, Augustin, Richard, William, Sarah, Tabatha, Mary and Jane…” [Essex County, Virginia, Will Book 15, page 436.]

Agreeable to an order of Essex Court dated the 21st day of January 1799 we the undersigned having met at the late dwelling House of Mary Gatewood decd. & proceeded to divide the negroes of Isaac Gatewood Decd. according to the last will and testament of the said decedent agreeable to the within statement given under our hands the 26th day of January 1799
Equal lots to Andrew Gatewood, Thomas Dunn, Augusten Gatewood, William Gatewood, John Kay, Richard Gatewood, Benj: Fisher, Charles Hutchason.
W Latane
James Upshaw jr.
Reuben Garnett
Sthreshly Rennolds
Returned on 18 February 1799 and ordered recorded.
[Essex County, Virginia, Will Book 15, pages 439–440.]