Elizabeth & John Dermont; dtr. Mary; Chas Co. MD 1710
From the book "Early Charles County Maryland Settlers, 1658-1745" by Bates & Wright:
CAMPBELL, Martin (barber) and Mary his wife, dau. of Elizabeth Dermont, wife of John Dermont and sister of Robert Downes Jr., son of Robert Downes Sr., dec'd.Indenture in 1702 to Nicholas Cooper, land descended to Mary by inheritance, 100 acres called 'Coldspring.'Indenture to Ralph Williamson of Liverpool, England, 14 Dec 1703; tract called 'Cow Spring' at Nanjemy (Nanjemoy) on the Potomac River, 100 acres. (Ct. & Land; Z#1, 86, 253).
There were no other listings for this name in the index.
I am not related to these families, and have no further information.