Llywelyn had come from the north, leaving his brother's forces. Llywelyn was drawn into an ambush near the market town of Builth in Powys on 11 December 1282. The first story is that he left his main force with his chief minister and, while crossing the Orewin Bridge, heard the sounds of battle and turned back to join the army. A lone lancer from the English forces of Edmund Mortimer chased him down and killed him. An English knight a day later recognized the body. His head was cut off and taken to London. This account was made about 50 years later.
Another version was recorded by English monks who got it from Llywelyn's daughter Gwenllian and Dafydd's daughter Gwladys. Their version claims that Llywelyn was at the head of his army and approached the foe, on the assumption that they were going to treat him with respect and even pay homage. A battle began immediately between the Welsh and the combined forces of Edmund and Roger Mortimer, Hugo le Strange, and Gruffydd ap Gwenwynwyn, son of Gruffydd ap Gwenwynwyn, who had allied with Edward in 1274. In the battle, Llywelyn and some retainers got separated and were chased into a wood. Llywelyn was a struck down, and asked for a priest. When he identified himself, he was immediately decapitated. The body was searched, revealing some papers—a list of co-conspirators—and the privy seal.
A letter from Archbishop of Canterbury John Peckham, who had tried to negotiate a truce between the Welsh and Edward, was dated six days later to the Bishop of Bath and Wells, stating:
If the king wishes to have the copy [of the list] found in the breeches of Llywelyn, he can have it from Edmund Mortimer, who has custody of it and also of Llywelyn’s privy seal and certain other things found in the same place.
This gives credence to the list of names.
The two women were not likely to have been anywhere near the battle—Gwenllian had been born the previous June. Did they hear the story from those who were present? Was it designed to make Llywelyn more heroic, at the head of his army?
Edward's forces could now concentrate on fighting Dafydd in the north. Dafydd, now Prince of Wales, engaged in guerrilla warfare for several months, but he destined to lose against superior forces. We'll finish him off tomorrow.