The Conquest of Wales

Hostilities between Wales and anyone living to the east who wanted to control them was ongoing for centuries, but it wasn't until Edward I of England that Wales became part of a United Kingdom. Edward's father, Henry III, was not a very effective ruler when it came to war, but Edward was prepared, after Henry's death in 1272, to make great strides in asserting the power of England on the island (and on the continent).

Henry wasn't completely ineffective on the Welsh issue. In 1267 the Treaty of Montgomery was signed by Llywelyn ap Gruffudd (1223 - 1282), Prince of Gwynedd—who held the largest unified part of Wales at the time—and Henry to stop recent hostilities and acknowledge Llywelyn as Prince of Wales—the only time a king of England established a Welsh leader's right to that title. All Llywelyn had to do was acknowledge the king of England as his liege. Llywelyn was willing to do that if it meant England left him alone. (The illustration shows Llywelyn on the left, Edward on the right.)

In 1274, the leader of Powys, Gruffydd ap Gwenwynwyn, and Llywelyn's younger brother, Dafydd ap Gruffydd, decided to throw their lot in with Edward for protection against some of the English lords (Roger Mortimer was one) who were attacking Welsh lands. Edward commanded Llywelyn to come to pay homage—as required by the Treaty of Montgomery. Llywelyn refused, and further angered Edward by arranging marriage (without Edward's blessing) to Simon de Montfort's daughter Eleanor. de Montfort had started a rebellion against Edward's father in 1263, trying to expand the statutes of Magna Carta and take more power from the Crown. This marriage would be advantageous to Llywelyn, and might mean de Montfort's descendant would rule (at least part of) Wales, but Edward saw it as an insult to his family.

Favorable to Edward was the fact that many nobles of Wales did not appreciate Llywelyn's heavy-handed overlordship. As the English started smaller incursions into Welsh territory, long before a major push with the main army, they were joined by the Welsh rulers who saw a path to having more freedom if Llywelyn were thrust from power. In July 1277, Edward's army marched north into Gwynedd with 6000 English troops and 9000 Welsh.

There is no battle named for what happened next, because there was no battle. The invading army never had to fight: Llywelyn realized he was outnumbered, and disliked by his own people, and accepted Edward's negotiation in order to avoid damage to the population and the countryside. This led to the Treaty of Aberconwy in November 1277. The Treaty left Llywelyn with the western part of Gwynedd and the title Prince of Wales, but the eastern part was divided between Llywelyn's brother David and Edward himself. With very little effort, Edward now controlled much of Wales.

This arrangement lasted five years, until David decided he wasn't happy with the little he was given, but that's a story for tomorrow. (Spoiler alert: I wrote about the result of Dafydd's efforts over a decade ago, if you aren't squeamish.)