4. Mary4 [Robinson] unmarried (chart). Her will, dated March 10, 1803, was proved July 4, 1803, she freed all her slaves, the males at 21 and the females at 18 years. Names niece Frances Yates Robinson, daughter of her brother John Robinson; nephew Matthew Whiting, and the other children of my late sister Whiting. Major James Ross and nephew Matthew Whiting executors.
http://files.usgwarchives.net/va/schools/wmmary/r1520000.txt