Thomas Stephens was a Welsh historian, literary critic, and social reformer. His works include The Literature of the Kymry (1849,1876), Madoc: An Essay on the Discovery of America by Madoc ap Owen Gwynedd in the Twelfth Century (1858,1893), and Orgraff yr Iaith Gymraeg (1859), as well as a number of prize-winning essays presented at eisteddfodau between 1840 and 1858. He was the first Welsh historian and literary critic to employ rigorous scientific methods, and is considered to have done more to raise the standards of the National Eisteddfod than any other Welshman of his time. Stephens also figured prominently in efforts to implement social, educational and sanitary reforms both locally in Merthyr Tydfil and more broadly throughout Wales.