Individual Details

Not proved as son of Archelaus and Ann Reed Mitchell
There is no record of this Archelaus's birth at St. Peter's Parish where the births/baptisms of the other children were born. Some have placed this Archelaus as a son of Thomas, making him a nephew of Archelaus, b. 1703, but this is highly unlikely - Thomas did have a son Archeluas whose birth was recorded and who married Mary Gregory, daughter of Richard Gregory. Perhaps the failure to record this Archelaus's birth was an oversight.

There is a single record in The Douglas Register of the baptism of Sally Mitchell, daughter of Archelaus Mitchell and Hannah Kirby. Sally was born 8 Nov 1761 and baptized on 9 May 1762. The parents are listed in the "implied marriage" section since they were named.

This family moved to Amherst which may explain why no other records are found in Goochland.

The following marriages recorded in Amherst (Virginia Marriages, 1785-1940; FamilySearch.org)
Presumably at least some are children of Archelaus and Hannah - it's doubtful any of these could be grandchildren since the younger Archelaus was the first male to marry in 1784. However, there are a lot of these marriages (14 of them) - I suspect more than one older Mitchell was in Amherst - yet no father other than Archelaus was listed and in the case when a mother was listed, it was after it is believe Archelaus had died - she was listed as "Ann Mitchell" but many Hannahs are also called Ann. It is also true that no given name is repeated among the fourteen recorded marriages.

Ann/Anna, married George Stovall, 6 Jan 1778, Amherst, her father named as Archelaus
Sally, m. Samuel Bell, 17 Jan 1780, Amherst
Archelaus m. Milley Burks, 19 Nov 1784. She was daughter of Elizabeth Burks
Lucey m. Samuel Hill, 5 Jan 1786. Daughter of "Archibald" Michell (probably misread)
Thomas m. Eady Trent, daughter of Henry Trent, 2 Jan 1792
Patsy m. John B. Trent, 2 Jan 1792. Father, Archelaus Mitchell (double wedding with Thomas?)
Mary, m. Elijah Moran on 3 Aug 1793. Mother, Ann Mitchell
Hanna m. John Murrell, Jr. on 27 Jan 1794
Winney m. Elias Hamblet, 15 Oct 1800, Amherst
Adam m. Elizabeth Alley, dau of Isaiah Alley, 26 Nov 1801
Stelly m. William Jones, 20 Jan 1802
Ralph m. Nancy Alley, daughter of Isaiah & Elizabeth Alley, 14 Oct 1803
Samuel B. m. Nancy Blass, 19 Oct 1804
Bowling m. Nancy White, daughter of Arthur White, 30 Sep 1805

Possible kinsman: Reuben Michell, whose will is found in Goochland, Virginia will book 13, page 310, link below.
https://www.familysearch.org/records/images/image-details?page=1&place=395019&rmsId=TH-1951-48091-14949-48&imageIndex=362&singleView=true
written- 25 Sep 1781
proved- 18 Aug 1783
uncle- William Michell "who has ever been as a father to me"
cousin- Ann Michell the daughter Archelaus Michell (making Archelaus the uncle of Reuben)
sister-Sally Michell
brother-Edmond Michell
brother- Gideon Michell
He mentions "old Assembly money".

Birth	Abt 1732	New Kent County, Virginia
Death	1792	Amherst County, Virginia

Father	ARCHELAUS MITCHELL (1703 - )
Mother	ANN REED (1707 - )
Sibling	William MITCHELL (1730 - )
Sibling	Susanna Mitchell (1734 - )
Sibling	LUCY MITCHELL (1736 - 1805)
Sibling	Mary MITCHELL (1738 - )