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c1828 Born in India
1850 Married Mary Anne Vaughan Brown in Auckland
1852 Ensign Thomas Light Elwon of the North York Regiment of Militia was promoted to Lieutenant
1857 Dissolution of the Partnership between Henry William Ferdinand Bolckow, John Vaughan, and Thomas Light Elwon, as Iron Masters, at the Cleveland Iron Works, at Eston Junction, near Middlesbrough, in the North Riding of York, under the style or firm of Thomas Light Elwon and Co.
1859 Elwon, Malcolm and Co built iron works at Clay Lane, comprising three blast-furnaces
1861 Thomas L Elwon 33, Captain North York Rifles, lived in Guisbrough with Mary A Elwon 28, Thomas H V Elwon 9, Mary L A Elwon 7, Florence A Elwon 4
1861 Captain of North York Rifle Regiment of Militia was promoted to Major 
1868 Dissolution of the Partnership between Thomas Light Elwon and William Malcolm, as Iron Masters, at Eaton Junction, and elsewhere, in the county of York, under the style or firm of the Clay-lane Iron Company.
1870 Captain Thomas Light Elwon of North York Regiment of Militia promoted to Major
1872 Major Elwon resigned his commission
1903 of Saltburn-by-Sea when he died