His eldest son and heir, David, renewed the homage to England; and having taken his brother prisoner, delivered him into Henry's hands, who committed him to custody in the Tower.

That prince, endeavoring to make his escape, lost his life in the attempt; and the prince of Wales, freed from the apprehensions of so dangerous a rival, paid thenceforth less regard to the English monarch, and even renewed those incursions by which the Welsh, during so many ages, had been accustomed to infest the English borders.

Lewellyn, however, the foil of Griffin, who succeeded to his uncle, had been obliged to renew the homage which was now claimed by England as an established right; but he was well pleased to inflame those civil discords, on which he rested his present security and founded his hopes of future independence.

He entered into a confederacy with the earl of Leicester, and collecting all the force of his principality, invaded England with an army of thirty thousand men.
He ravaged the lands of Roger de Mortimer, and of all the barons who adhered to the crown;[*] he marched into Cheshire, and committed like depredations on Prince Edward's territories; every place where his disorderly troops appeared was laid waste with fire and sword; and though Mortimer, a gallant and expert soldier, made stout resistance, it was found necessary that the prince himself should head the army against this invader.

Edward repulsed Prince Lewellyn, and obliged him to take shelter in the mountains of North Wales: but he was prevented from making further progress against the enemy by the disorders which soon after broke out in England.
The Welsh invasion was the appointed signal for the malecontent barons to rise in arms; and Leicester, coming over secretly from France, collected all the forces of his party, and commenced an open rebellion.
He seized the person of the bishop of Hereford, a prelate obnoxious to all the inferior clergy, on account of his devoted attachment to the court of Rome.[**] Simon, bishop of Norwich, and John Mansel, because they had published the pope's bull, absolving the king and kingdom from their oaths to observe the provisions of Oxford, were made prisoners, and exposed to the rage of the party.