I wrote a blog post in January 2010 about the revolt of Llywelyn Bren in Glamorgan and his attack on Caerphilly Castle in early 1316, and in this post, I'm going to focus on Llywelyn's execution in c. 1318 and what we know about it. Hugh Despenser the Younger, lord of Glamorgan from 1317 to 1326, has always been held responsible for subjecting Llywelyn to a grotesque death by drawing, hanging, beheading and quartering, and it's entirely possible that he was indeed responsible, but the evidence is somewhat meagre. Oh, and a rather off-topic point here, but the inventory of Llywelyn Bren's goods seized in 1316 reveals what a cultured man he was: he owned a manuscript of the Roman de la Rose in French as well as three books in Welsh and four other unidentified books. You can see the inventory on British History Online, here.On 26 March 1316 after the revolt was put down, Edward II ordered Llywelyn, his wife Lleucu, five of his six or seven sons and six other Welshmen to be sent "under safe custody at the king’s expense" to the Tower. On 10 May 1316, they were granted either three pence a day for their maintenance (Llywelyn and Lleucu) or two pence (all the others), and their names were recorded as "Lewelin Pren and Leukina his wife...Griffin ap Lewelyn, James ap Lewelyn, David ap Lewelyn, Meurik ap Lewelyn, Roger ap Lewelyn". The six others were named as "Howel ap Ivor, Ievan ap Ivor, Lewelin ap Maddok, Madoc Vaghan, Grenou ap Rees, Res Meskyn". By 17 June 1317, only Llywelyn and two of his sons - their names now spelt Lewelin Pren, Griffin and Yevan, i.e. Gruffudd and Ieuan - are mentioned as prisoners in the Tower, the others presumably having been released. All three men were allowed three pence a day.  The claim made by one chronicler and some modern writers that Llywelyn and his family and supporters were held at Brecon by the earl of Hereford for a few months and only transferred to the Tower of London on or about 27 July 1316 is inaccurate. Edward II's order of 10 May 1316 to pay them 2d or 3d a day states "for the time that they have been in the Tower, and to continue to pay the same" (Close Rolls, p. 283).
"This year Leulin Bren was condemned at Cardiff, as he deserved; and afterwards he was drawn by horses as a traitor, then hanged, his entrails burned and scattered, his limbs cut off and sent through the whole of Glamorgan, to strike terror into other traitors."