Converting Walter Davies' equivalent, 1 Welsh mile was 6.185 kilometers. Davies is quoting from the Venedotian Code, book 2, chapter 17, section 5.
As for the olde Brytishe myle that includeth 1500. paces english, it shal not greately néede to make any discourse of it, & so much the lesse, sith it is yet in use and not forgotten among the Welch men, as Leland hath noted in his commentaries of Bryteine, wherfore it may suffise to have saide thus much of the same, and so of all the rest, beyng mindfull to goe forwarde and make an ende of this treatize.
An Historical description of the islande of Britayne, with a briefe rehearsall...
Book 3, chapter 22.
Chronicles of England, Scotlande, and Irelande. Volume I.
London: Iohn Hunne .
The vulgar notion of a Welsh mile is both extravagant and indefinite. By reference to the Welsh Laws, new modelled by Howel in the tenth century, the definition of a mile is there attributed to Dyfnwal, before the birth of Christ; and said to be as followeth: three barleycorns in an inch; three inches in a handsbreadth; three handbreadths in a foot; three feet in a pace; three paces in a leap; three leaps in a ridge of land; and one thousand ridges of land in a mile:—hence the term milldir, or a thousand ridges. By the foregoing definition, a Welsh mile is equal to three miles six furlongs twenty-seven poles and 15 yards English.
General View of the Agriculture and Domestic Economy of North Wales; Containing the Counties of Anglesey, Flint, Caernarvon, Meirionydd, Denbigh, Montgomery. Drawn up and published by order of the Board of Agriculture and Internal Improvement.
London: Printed for Richard Phillips, Bridge Street; Sold by Poole & Broster, etc. 1810.
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