Thomas Cornog was born in 1735 in Radnor, Chester County, PA, and died on 20 August 1790 in Haverford, Delaware County, PA. He was the son of David Cornog and Catherine Davis. Thomas married Margaret Edwards in March of 1756 in PA. She was the daughter of John Edwards, Sr. and Ann. Margaret was born in 1738 in Chester County, PA, and died on 5 July 1811 in Haverford, Delaware County, PA. Both Thomas and Margaret are buried in Great Valley Baptist Church Cemetery, Tredyffrin Township, Chester County, PA. Thomas and Margaret had 8 children: John Cornog (1756-1828); Ann Cornog (born after 1736- ?); Catherine Cornog (born after 1756 – before 1796); Elizabeth (born after 1756 - 1796); Hannah Cornog (1759-1821); David Cornog (1767- 1834); Sarah Cornog (1769-1896); and Jane Cornog (1775-1795).
Thomas provided patriotic service in Pennsylvania.