By his marriage with Elizabeth, daughter of
Charles Fleetwood, Hartopp inherited
Fleetwood's house. The estate sat at the intersection of
Stoke Newington Church Street and
Ermine Street, the old Roman road leading north from the
City of London. He is thought to have had a family of four sons and nine daughters. His son and successor,
John (1680?–1762), with whom the baronetcy became extinct, assisted
Lady Mary Abney in erecting a monument over Watts's remains in
Bunhill Fields. He had two daughters. Elizabeth married
Timothy Dallowe, the physician and chemist. Anne married
Joseph Hurlock, and their only child was
Anne Hurlock "eventually heir and representative of the Hartopps" One of Sir John Hartopp's daughters was Frances, who married
Nathaniel Gould (1661–1728), merchant, politician, shipbuilder, and a
Governor of the Bank of England from 1711 to 1713 at the time when the
South Sea Company was founded. The Goulds lived at Fleetwood House. One of their children married
Thomas Cooke, also
Governor of the Bank of England from 1737 to 1740. Mary Gould married Sir Francis St John, of
Thorpe Hall (Peterborough), ==Notes==