Peter Clement Bartrum (1907-2008) was born in Hampstead, London, educated at Queen's College, Oxford, and worked as a meteorologist in the Colonial Service, 1932-1955. He spent much of his life researching the mediaeval Welsh genealogical manuscripts, learning to read Welsh to do so, and coming to be considered an authority on them. He also had an interest in the early Arthurian legends. He published 'Welsh genealogies AD 300-1400' (8 vols, 1974), 'Welsh genealogies AD 1400-1500' (18 vols, 1983), 'Early Welsh genealogical texts' (1986), and 'A Welsh classical dictionary : people in history and legend up to about AD 1000' (1993). His own annotated copies of these are in the process (2015) of being made available online by Aberystwyth University
at the project page
. His papers are held by the National Library of Wales
. An obituary was published in Studia celtica
, vol. 43 (2009), pp. 221-2.