Martha "Mattie" Gregory was born in Charles City County in 1851 to Judge John Munford Gregory and Amanda Wallace Gregory. In 1879, she married Robert Davidson Galbraith and relocated to Spartanburg, SC. She and her husband had five children, though only two (Letitia "Letty" Gregory Galbraith and John Munford Gregory "Greg" Galbraith) survived to adulthood. Mattie Galbraith died in 1924.
This biographical information comes entirely from the Gregory Family Papers and correspondence with a surviving descendant.