Mary (c. 1660-post 1713/4) was the great-grandmother of Thomas Jefferson. She is descended from William I, King of Scotland through her father.
From her grave marker.
"Mrs. Mary Randolph his wife dyed Dec. 29, 1735 She was the daughter of Mr. Hen: Isham by Katherin his wife: He was of Northampton Shire but late of Virginia Genl."