I do have more information on these people, but I can't find it right now.I moved about a year and half ago and still do not have all my genealogy information straightened out.I will check further when I find it.I will have to get back to you on Sarah and Ralph Briscoe.
I haven't researched these people in years, because I found out they were not on my line. A "cousin" Philip Noland married Mary Delashmutt about 1761 in Loudoun Co., VA and had (among other children) a son Philip Nelson Noland, who possibly went to Ohio.I believe Mary was the daughter of Elias and Elizabeth Nelson Delashmutt.Mary D. Noland left a will in Frederick Co., MD dated 25 May 1785.I saw this in "Abstracts of Loudoun County Wills" by King.You might want to contact the Loudoun County Historical Society.
In the book "Records of Old Monocacy" by Grace Tracey and John Dern I read that Arthur Nelson Sr. and wife Jane were the in-laws of Elias and John deLashmutt (Arthur referred to them as his "beloved sons."Elias had married Elizabeth Nelson and John married Sarah Nelson.)Arthur Nelson, Jr. had a daughter Sally who married a Col. Luckett (another Loudoun Co. family).The book by Tracey and Dern has been updated and reprinted as "Pioneers of Old Monocacy" and is avaliable for purchase.
The Nelsons owned land near what is now Point of Rocks, Maryland, which is in the south-western part of Frederick County where Rt. 15 crosses the Potomac River into Loudoun County, VA.The DeLashmutts also owned land in that area.I believe Elias also lived in Jefferson (then called Trappe) in Frederick County.I lived there for about six years recently; very nice old tiny town.You might want to write the Frederick County Historical Society on Church St. for more information on these people.I believe I spoke to a man there recently who has done research on the DeLashmutts (his wife's line, I think).
I believe this same Arthur Nelson also owned several parcels of of land totaling over 3,000 acres in early Montgomery County (which was part of Frederick until 1776.) This was about 1713-21 and was located in what are now the Rockville and Derwood areas of Montgomery County.You can write the Montgomery County Historical Society, Beal-Dawson House, Rockville, Maryland20850 for further information.
I hope this information will help a little, or at least give you some leads, and I hope I haven't given you any mis-information; sometimes my handwriting is very difficult to read.All these societies I have mentioned have great libraries.