|Sunset over Llanberis|
His final acts as prince occured on 2 May. On that day Gruffudd ap Maredudd, one of Dafydd’s remaining supporters, agreed to grant Cantref Penwedding to Rhys Fychan of Ceredigion. At the same time Dafydd empowered one of his officers, John son of David, to call out the men of Builth, Brecon, Maelienydd, Elfael, Gwerthyrnion and Kerry. The intention was to summon one last army and stage a final stand against the troops of Edward I as they poured into the mountain citadel.
Unknown to Dafydd, Rhys Fychan had surrendered to the king at Rhuddlan at the start of March. In exchange for his life, Rhys agreed to do military service at Aberystwyth for forty days for a fee of £16:
“Payment to Res ap Mailgun, admitted to the lord king’s wages, by order of lord W. de Valence, the lord bishop of St David’s and lord Robert Tybbetot, to guard the land of ‘Lanpader’ with 2 covered horses and 4 uncovered horses and 24 foot-soldiers, from 11 March until Monday 19 April, for 40 days, £16.”
Nobody answered Dafydd’s military summons, since the men of Maelienydd and elsewhere had already submitted to the king.
Goronwy was one of those who witnessed these two futile charters. He was killed shortly afterwards, probably in a skirmish during the final days of the invasion. All we know of his death is a brief note in the survey of the Honour of Denbigh, drawn up in 1334. This records that Goronwy ap Heilyn Sais had died ‘contra pacem’ - against the peace. The lands of his son, Madog, escheated to the crown, while another son, Llywelyn, was still in prison in 1316.