Annals of Margam. 1204. Rex Francorum cepit castrum de Chynim [Map], et postea omnes munitiones Normanniæ, Andegaviæ, et civitatem Pictavis, cum aliis castellis, oppidis, et civitatibus quas voluit habere, et hac ratione; cum rex Johannes cepisset Arthurum, eumque aliquamdiu in carcere vivum tenuisset, in turre tandem Rothomagensi, feria quinta ante Pascha, post prandium, ebrius et dæmonio plenus, propria manu interfecit, et grandi lapide ad corpus ejus alligato, projecit in Secanam; quod reti piscatorio, id est, sagena, inventum est, et ad littus tractum, cognitum; et in prioratu Becci, qui dicitur Sanctse Mariæ de Prato, occulte sepultum, propter metum tyranni. Quod cum fama vulgante audisset prædictus rex Francorum, et pro certo sciret Arthurum esse occisum, fecit summoneri interfectorem ejus Johannem ut veniret ad curiam Francise, uti solent duces Normannise, de occisione tanti viri responsurus, et se si posset defensurus: tanti, inquam, viri ; erat enim legitimus hseres Anglise, comes Britannise, et gener regis Franciæ. Illee tanti mali sibi conscius, nunquam ausus est comparere, sed fugit in Angliam, et in ea super homines suos gravissimam tyrannidem exercuit, usque ad mortem suam. Postquam autem nunquam venit ad respondendum de morte Arthuri, et se defendendum, per judicium curiæ regis et principum Francorum, abjudicatus est, et exhæredatus est cum omnibus hæredibus suis de universis terris et honoribus quos teniiit de corona Francise; et fixum et justum judicium hoc.

The king of the Franks took the castle of Chinon [Map], and afterwards all the fortifications of Normandy, Andes, and the city of the Poitevins [Poitiers], with other castles, towns, and states which he desired to have, and in this manner; when King John had taken Arthur, and kept him alive in prison for some time, in Rouen Castle, Thursday before Easter, after dinner, drunk and full of demons, he killed him with his own hand, and a great stone bound to his body, threw it in the Seine; which was found in a fishing net, that is, a sedge, it was found, and the tract of land known; and in the priory of Becci, which is called Sanctse Maria de Prato, buried secretly, for fear of the tyrant. The aforesaid king of the Franks had heard it by popular report and he knew for certain that Arthur had been slain, he summoned John, his murderer, to come to the court of Francis, Norman leaders usually use it, he would answer for the killing of such a great man, and would defend himself if he could: so much, I say, men; For he was the legitimate heir of England, earl of Britain, and son-in-law of the king of France. He was aware of so much evil, he never dared to appear, but fled to England, and in it he exercised the most severe tyranny over his men, until his death. But after he never came to answer for Arthur's death, by the judgment of the court of the king and the princes of the Franks, he was adjudged and he inherited with all his heirs all the lands and honors which he held from the crown of Francis; and this judgment is fixed and just.