From A Great and Terrible King: Edward I and the Forging of Britain, by Marc Morris (Pegasus, 2015), Kindle pp. 26-28:
Geographically, of course, there were similarities between Wales and Scotland that a first-time visitor would have readily appreciated, and this meant that economically, too, they had certain similarities – Wales, like Scotland, was poor in comparison with England. Culturally, however, Wales was very different from both its near neighbours. Perhaps most obviously, the Welsh spoke Welsh, even at the highest social levels. This was a source of pride to the Welsh themselves, but to the French-speaking kings and nobles of England and Scotland it sounded like so much incomprehensible babble.
More perplexing still for English and Scottish onlookers, and far more problematic, were Welsh social attitudes, which stood in sharp opposition to their own. Take, for instance, the rules governing inheritance. In England and Scotland, and indeed almost everywhere else in western Europe, the rule was primogeniture: firstborn sons inherited estates in their entirety. This was hard on any younger brothers or sisters, but had the great advantage of keeping a family’s lands intact from one generation to the next. In Wales, by contrast, the rule was ‘partibility’: every male member of the family – not just sons and brothers, but uncles and nephews too – expected his portion of the spoils, and rules of precedence were only loosely defined. This meant that the death of a Welsh landowner was almost always followed by a violent, sometimes fratricidal struggle, as each male kinsman strove to claim the lion’s share.
The result of this idiosyncratic approach to inheritance was that Welsh politics were wont to be tumultuous. The fact that partibility applied at the highest levels was one of the main reasons why there was no single political authority in Wales as there was in England and Scotland. Welsh poets spoke of their country as if it were neatly divided into three kingdoms, but this was a broad simplification; the reality was a complex patchwork of petty lordships. Occasionally one ruler might, through force of arms, diplomacy or sheer good luck, contrive to establish something greater. But such constructs were always temporary. When a successful Welsh ruler died, his work was swiftly undone by the general carve-up that inevitably followed.
Such cultural and political differences meant that the English found it difficult to do business with the Welsh as they did with the Scots. Inherent instability meant that amicable relations were hard to sustain. The king of England could marry his daughter to the king of Scots, safe in the knowledge that her rights would be guaranteed; but he would not give her away to a Welsh ruler, no matter how great, for who knew how long his greatness might last?
And yet, if the English found the practice of partibility baffling, they were far more troubled when the Welsh showed any signs of abandoning it. From the start of the thirteenth century, up until the time of Edward’s birth, there had been a worrying (from the English point of view) movement in the direction of pan-Welsh political unity. Gwynedd, the most remote and traditional of Wales’s three ancient ‘kingdoms’, had extended its power from the mountains of Snowdonia to cover much of the rest of the country. When, therefore, the architect of this expansion, Llywelyn the Great, had died in 1240, Henry III had been quick to intervene and undo his work. In the years that followed, Gwynedd was torn down to size, and its pretensions to leadership were crushed. Llywelyn’s descendants were forcibly persuaded to follow traditional Welsh practice and share power among themselves. Lesser Welsh rulers who had formerly acknowledged Llywelyn’s mastery were disabused, and obliged to recognise that their proper overlord was, in actual fact, the king of England. Most contentiously, Henry confiscated and kept for himself a large and comparatively prosperous area of north Wales. Known as Perfeddwlad (middle country) to the Welsh, and as the Four Cantrefs to the English, this region between the rivers Dee and Conwy had been contested by both sides for hundreds of years, but Henry was determined that from that point on the English would retain it for good. The Four Cantrefs, he declared, were an inseparable part of the Crown of England, and to give force to this assertion he built two new royal castles there, one at Dyserth, the other at Deganwy. At the same time, lordship in the region was made more exacting. From their base at Chester, royal officials introduced English customs and practices, including more punitive financial demands. By 1254, when the Four Cantrefs (or ‘the king’s new conquest in Wales’, as they were now also being termed) were handed over to Edward as part of his endowment, the castles were complete, and the process of anglicisation well advanced. At the time of Edward’s visit two years later, his officials there were in a supremely confident mood. According to chronicle reports, his chief steward boasted openly before the king and queen that he had the Welsh in the palm of his hand.