Only one poem by the poet Hywel ab Einion Llygliw [cy] has survived, but among the most famous work is an ode to Myfanwy Fychan "of Castell Dinas Brân":Lliw eiry cynnar pen Aran, Lloer bryd, lwys fryd o lys Frân.
[1][the] colour of the early snow on the top of Aran, with the countenance of the moon, from the court of BrânCastell Dinas Brân was in ruins by the time the poem was written, but it seems that Myfanwy ferch Iorwerth Ddu was the girl that Hywel was writing about.
The alabaster tombstone of Goronwy Fychan, who died in 1382, along with a statue of him and his wife, can be found in the parish church of Penmynydd.
The text of the poem by Hywel ab Einion Llygliw was printed in The Myvyrian Archaiology of Wales which brought it to national prominence.
The words were put to music by Joseph Parry and published under the title Myfanwy, which went on to become one of the most popular Welsh songs ever.