The name survives in the epithet of Cadrawd Calchfynydd, apparently a 6th-century ruler of the district. Welsh sources refer to Cadrawd as one of the Gwyr y Gogledd or 'Men of the North', suggesting the area was located somewhere in northern Britain. William Forbes Skene suggested an identification with Kelso (formerly Calchow) in southern Scotland.[4]Rachel Bromwich agrees that Kelso or a similar location in the Hen Ogledd is most likely, while noting that Kenneth Jackson doubted this identification.[1] Alistair Moffat in his history of Kelso supports this position, citing early references to "Chalchou," as well as the chalk area and Chalkheugh Terrace.[5] John Morris placed it south of the realm of Urien of Rheged, "between Trent and Thames".[6][7] Based at least in part on the forgeries of Iolo Morganwg, the Rev. Thomas Barns located Calchfynydd around Dunstable,[8] however sources predating Iolo's time, notably 18th century antiquarian Henry Rowlands' Mona Antiqua Restaurata and David Powel's sixteenth century History of Wales, mention a connection with Dunstable through "Cadrod Calchfynydd" being Earl of Dunstable (a very anachronistic title) in the post-Roman period.[9][10]Robert Owen placed the kingdom among the Cotswolds.[2]
^ abBromwich, Rachel (1961). Trioedd Ynys Prydein (2014 ed.). University of Wales Press: Cardiff. p. 327.
^Barns, Rev. Thomas (1911). Bladen, W. Welles (ed.). "Annual Address: The Making of Mercia". North Staffordshire Field Club Annual Report and Transactions, 1910-1911. XLV. Stafford: J. & C. Mort: 64. Retrieved 28 May 2025.