‘[Thomas] de Clare had built a castle of dressed stone, girt with [a] thick outer wall, containing a roofed impregnable donjon, and having capacious lime-whited appurtenances; this settlement then he, with common English so many as by bribes and purchase he was able to retain, proceeded to inhabit … and after expulsion of the ancient dwellers on the soil [around] … he assigned that region to plebeian English.’ Although an account of English activities in Ireland in the late-thirteenth century, this excerpt from The Triumphs of Turlough also encapsulates the two crucial phases of settlement in contemporary Wales: the establishment of a castle, and the firm planting of both an urban and a rural immigrant community. Nowhere in Wales can this process be traced as minutely as in the lordships of Denbigh and Ruthin, both created after the final English conquest in 1282–83.

After his successful campaigns in North Wales in 1277 and 1282–83, Edward I divided the spoils of battle, huge tracts of land in northeast Wales, among his trusted followers. Of this land, the fertile region bordering the river Clwyd contained the most valuable soil in the region, and it is no surprise that it was gifted to two of Edward's most capable leaders: Henry de Lacy, earl of Lincoln, and Reginald de Grey. On 16 October 1282, de Lacy received over 68,000 acres of prime real estate in northeast Wales in what was to be known as the lordship of Denbigh, an area roughly equivalent to a small English county.