Born c.1744, 28-year-old Mary Alsop (nee Frogat) was the wife of the noted John Alsop, who later served in the Continental Congress. She had married the wealthy merchant, who was some twenty years her senior, on June 6, 1766. Three years later she gave birth to their only child, a daughter named Mary, who in time became the wife of Rufus King, a signer of the US Constitution. Mrs. Alsop's gravestone, like that of her father-in-law's nearby, appears to be the work of the noted Manhattan carver John Zuricher. It is somewhat unusual in that it was not carved brown sandstone, as were the majority of gravestones in the NY-NJ area during the colonial era. The inscription reads:
"IN MEMORY OF MARY ALSOP, WIFE OF JOHN ALSOP, MERCHANT, WHO DEPARTED THIS LIFE THE 14TH OF APRIL 1772 AGED 28 YEARS"