Individual Details

Parents said to be Thomas Turner & Martha Taliaferro. I have no proof for Susanna's surname or her parents. Another possibility often cited is Susanna Marshall.

The King George Co., VA Order Book #2, p. 619, dated March 3, 1749, states: "The nuncupative will of William Longmire, Dec'd was presented into Court by Susanna Longmire." (a nuncupative will is an oral will that must later be reduced to writing). A notation on the book entry stated that no will was found in the records. An inventory of his estate was recorded in Inventory Book #2, p.47, dated June 2, 1749.
NOTE: The above event took place after the proving of the will of William Marshal - see later. She was very much Susanna Longmire in March of 1749.

Found in online trees (WorldConnect & Ancestry) without any substantiation: William's wife possibly a Susanna, maybe Susanna Turner, b. abt 1715, d. 1783, daughter of Thomas Turner & Martha Taliaferro.
Many other trees regarding Thomas Turner's family show no such daughter.
And indeed no such daughter as Susanna is listed in the article on the Turners found on JSTOR (The daughter is SARAH - researchers have justified the connection and claimed Susanna & Sarah to be interchangeable names which of course they are not!):
The Turner Family of King George County &c (Continued), "The Virginia Magazine of History and Biography", Vol. 21, No. 1 (Jan., 1913), pp. 106-109

Researchers claim the following Sarah Turner Dixon to have been Susanna Longmire, which of course she could not have been since she had been married to William Longmire for about 10-11 years when she witnessed the following will and when the will was proved. It is interesting that her husband witnessed the will and there are later connections between the Longmire & Marshall families.
In the Name of God Amen. I William Marshall, Senr: of Hanover Parish in the County of King George being sick and weak in body but of perfect mind and memory thanks be given to Almighty God for the same and calling to mind the mortallity of my body and knowing tht it is appointed for all men once to die, Do make and ordain this my last Will and Testament in manner and form following.
I give and bequeath to my eldest son William Marshall the plantation and tract of land whereon he now liveth during his natural life and after his decease to descend to my four youngest sons George, Rush, Hudson, and Merryman Marshall to be equally divided amongst them as they shall think proper.
I give and bequeath to son Benjamin Marshall the plantation and tract of land I bought of John England (whereon Thomas Sachery Now Dwelleth) during his natural life and after his decease to descend to my four youngest sons George, Rush, Hudson & Merryman Marshall to be equally divided amongst them as they shall think proper.
I give and bequeath to my loving wife Anne Marshall the plantation and tract of land whereon I now live during her natural life and after her decease my will and desire is that the same shall be sold and the produce thereof to be equally divided among all of the survivors of them four.
I give and bequeath to my son William Marshall after the decease of his Mother eight pounds current money.
I give and bequeath to my son Benjamin Marshall after the decease of his Mother six pounds current money.
I give to my four sons George, Rush, Hudson and Merryman Marshall five pounds current money each to be paid them as they shall severally arrive of age if they continue with their Mother till they do arrive to be of age.
Item: I give to my loving daughter Elizabeth Marshall a mulatto girl named Sarah with all her future increase to be delivered her on the day of marriage or when she shall demand her after her marriage to her and her heirs forever and if she should die without heirs to descend to my estate again.
Item: I give to my loving daughter Anne Marshall fifteen pounds current money to be paid her on day of marriage.
Lastly I give unto my loving wife Anne Marshall all the rest of my personal estate during her natural life and after her decease to be equally divided amongts my four youngest sons George, Rush, Hudson and Merryman Marshall and my two daughters Eliza. & Anne Marshall and do appoint my loving son William Marshall Executor and my loving wife Executrix of this my last Will & Testament. In twiness where of I have set my hand and affixed my seal this 24th July 1746
William Marshall
Witnesses: William Longmire, William Robins, Sarah Turner
At a Court held for King George County on Fryday February 3. 1748/9.
The last Will & Testament of William Marshall, Senr., Deceased, was presented into court by Anne Marshall one of the Executors who made oath thereto and the same was proved by the oath of Sarah Dixon (late Sarah Turner) and admitted to record. Harry Turner CL: Cur:

Birth	1715	Virgina
Marriage	Abt 1735	Virgina - WILLIAM Longmire
Death	1783

Spouse	WILLIAM Longmire ( - 1749)
Child	George Longmire (1736 - 1785)
Child	Charles Longmire (1739 - 1797)
Child	WILLIAM Longmire (1740 - 1816)
Child	Simon Longmire (1749 - )
Child	Elizabeth Longmire (1748 - 1820)