Research Notes:

Philip Dorddu ap Howel ap Madog, who was alive about the year 1350, lived in the neighbourhood of Llanbister in the Valley of the Ieithon. An old manuscript in the Llanstephan collection gives what purports to be a list of his father's houses, namely-Baili Glas, Llinwent, Cantal, Rhos-y-meirch, Gardd Fagu..., Croes Cynon, Y Trallwng Byr, Craigfryn Howel, and several others. Philip had at least four sons-Gruffydd, Hywel, Maredudd and Cadwgan, and these sons inherited from their parents lands near to Llanbister named Bron-y-ganllwyd, Penhernyw, and Trallwng Byr.... [It] it is evident from the poem of Iolo Goch's...that that poet was accustomed to visit these people, to sing his odes at their feasts, to praise their great ancestor, Elystan Glodrydd, prince between Wye and Severn, and to trace their family connections in intricate genealogical poems.Unfortunately, these poems have not survived to our day; still, a good number of others addressed to their children and grandchildren have been preserved. Several were addressed to Dafydd Fychan ap Dafydd ap Cadwgan ap Philip Dorddu; that is, to a grandson of one of the patrons of Iolo Goch. This Dafydd fychan lived at Llinwent, which today is a farm near Llanbister. ³