David Cornog was born in 1693 in Llangolman, Pembrokeshire, Wales, and died on 24 April 1780 in Radnor, Chester County, PA. He married Catherine Davis in Wales. She was born in 1698 in Rhydwylym, Pembrokeshire, Wales, and died on 11 December 1779 in Radnor, Chester County, PA. David and Catherine are both buried in Great Valley Baptist Church Cemetery, Tredyffrin Township, Chester County, PA. Their children are Jane, Mary, William (1725-1780), Catherine (1731-1784), Thomas (1735-1790), Sarah (1736-1810), Abraham (1739-1802), and Daniel (1740-1802).
David Cornog provided patriotic service during the American Revolution in Pennsylvania.