Elmham wrote a history of the monastery of St. Augustine at Canterbury, which was edited by Charles Hardwick for the Rolls Series (1858); and a Liber metricus de Henrico V, edited by C. A. Cole in the Memorials of Henry V (1858). As well as this verse life of Henry V, Elmham himself says he wrote a prose biography of the king. The eighteenth-century editor of the Vita et Gesta Henrici V, Thomas Hearne, made a claim for Elmham's authorship of that biography but, in fact, it was written in the mid-1430s, long after Elmham's death. The attribution was rejected by the early twentieth century and the Vita et Gesta since then has gone by the designation of 'Pseudo-Elmham' (this biography was the main source of the Vita Henrici Quinti by Tito Livio Frulovisi). In the early twentieth century, it was suggested instead that Elmham's prose life could be equated with the Gesta Henrici Quinti, which is the best authority for the life of Henry V from his accession to 1416. This work, sometimes referred to as the chaplain's life, and thought by some to have been written by Jean de Bordin, was first for the English Historical Society by B. Williams (1850). However, the modern editors of the Gesta convincingly rejected this attribution to Elmham. In short, the prose life by Thomas Elmham is not known to survive.
C. L. Kingsford, ‘The Early Biographies of Henry V’, English Historical Review, xxv (1910), pp. 58 – 92.
F. Taylor & J. S. Roskell ed., Gesta Henrici Quinti (Oxford, 1975), pp. xviii – xxiii and iid., ‘The Authorship and *Purpose of the Gesta Henrici Quinti: I’, Bulletin of the John Rylands Library, liii (1970 – 71), pp. 428 – 464.