| Father | David Nehemiah Johnston (b. 1757, d. 1777) |
| Mother |
| Son | Mark Robertson Roberts+ (b. 6 December 1797, d. 15 March 1870) |
| Son | Moses Fiske Roberts+ (b. 9 July 1803, d. 7 April 1889) |
| Pedigree Chart | |
| Relationship | 4th great-grandaunt of Charles Ryland ("Ryland") Scott 6th great-grandaunt of Isaac Silas Vaughn 6th great-grandaunt of Katherine Gilstrap Scott 6th great-grandaunt of Joseph Ryland Scott 6th great-grandaunt of Charles Parker ("Parker") Scott 6th great-grandaunt of Orly Marie Vaughn 6th great-grandaunt of Avital Catherine Vaughn |
| Person Source | Mary Polly Johnston had person sources.1 | |
| Birth | 17 May 1772 | She was born on 17 May 1772 in Watauga Settlement, TennesseeBG. |
| Marriage | 5 November 1789 | General Isaac Roberts and she were married on 5 November 1789 in Johnson's Lick, Davidson, TenneseeBG.2 |
| Death | 15 March 1844 | She died on 15 March 1844 at age 71 in Columbia, Maury Co., Tennessee, United StatesBG. |
| Last Edited | 6 April 2020 |